First time building a PC (gaming)

Hey all, this is my first time building a PC and I would like some feedback regarding the parts I have chosen carefully. It will be a gaming PC and the resolution will be 1920x1080. I’m just worried if the parts I’ve chosen aren’t compatible with each other or something; for example, is the motherboard good enough? Should I choose a z77 over the z68? I know the psu is good enough but will it support overclocking and stuff like that, and will the cpu cooler support overclocking the 2600k? I still have a lot to learn regarding overclocking but since I don’t intend on overclocking any time soon it’s not too big a deal, it's just something that I will be interested in in the future. And is 16gb of ram too much? I originally went with 8gb but I have a budget of $1500 so I was able to raise it to 16gb no problem for future-proofing and dual monitoring purposes. I also intend on dual monitoring sometime, for instance playing Diablo 3 and skyping on the other monitor (much to my gf’s chagrin). I want my PC to be fairly future-proofed so I chose an i7 so I wouldn’t have to worry about it for a long time (I plan on buying an i7 over an i5 no matter what; I know I’ll hear some i5’s > i7’s for gaming due to price but I have the money) and that’s also why I opted with 16gb of RAM (although I may downgrade to 8gb if somebody suggests it seeing as how I could probably just buy 16gb of RAM in the future when it’s cheaper if 8gb is all I need for gaming and ****). The hard drive is something I already have so it’s technically not included in my budget, I’m just wondering if it’s a good enough hard drive as it is kind of old compared to the other parts I chose, but it still has 7200rpm and 250gb is all I need as I tend to delete things I don’t use, and I also intend to buy an SSD soon after I build my PC. It’s a WD2500JD. Also, I have some old optical drives that I plan on using if that’s a normal thing to do? Lastly, I chose a GTX 680 but I’m not sure how hard they are to obtain and I’m not going to wait for them to come in stock when I start to build my PC (in the next couple of days I’ll go over to Canada computers and buy the parts/order the parts they don’t have online), so which gpu should I choose over it if I can’t find a 680? I was thinking an HD 7970, a gtx 570 ti, or gtx 580. I just want to make sure I don’t run into any compatibility issues when building my PC, for instance the cpu cooler being an inefficient cooler for the cpu or the motherboard not being good enough for the other parts. I’ve done quite a bit of research so I’m pretty confident my parts will work well with each other, it would just suck to find out I missed something. The case I chose isn’t the one I’m going to settle with, I’m just looking for one in that price range ($80) but I’ll find one at the store or something. Although, the mobo I chose doesn’t have any usb 3.0 headers, so does that mean I need to find a case without usb headers or will the usb headers still work, they’ll just be usb 2.0 headers? I don’t need to use usb 3.0 headers that’s for sure but usb 2.0 headers are something I’d probably take advantage of. I admit I’m not tech-savvy so any feedback and suggestions are greatly appreciated as I plan on building my PC in the next couple of days and I will be checking for any replies constantly because over the past few weeks building a PC and learning about the factors surrounding it has really generated my interest and I’ve been doing a bunch of research and educating myself. Thanks guys.

CPU: Intel Core i7-2600K 3.4GHz Quad-Core Processor ($259.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.90 @ NCIX US)
Motherboard: ASRock Z68 Extreme3 Gen3 ATX LGA1155 Motherboard ($129.86 @ Newegg)
Memory: Corsair Vengeance 16GB (4 x 4GB) DDR3-1600 Memory ($97.98 @ Amazon)
Hard Drive: Western Digital Caviar SE 250GB 7200RPM Internal Hard Drive (WD2500JD) ($69.94 @ Amazon) http://www.storagereview.com/articles/200309/20030904WD2500JD_8.html
Video Card: EVGA GeForce GTX 680 2GB Video Card ($507.55 @ Newegg) (or HD 7970)
Case: Cooler Master CM690 II Advanced ATX Mid Tower Case ($75.98 @ Newegg)
Power Supply: Corsair 750W ATX12V / EPS12V Power Supply ($129.99 @ Newegg)
Total: $1301.19
Peripherals: 24” Samsung monitor, Razor DeathAdder Mouse, Razor Ultimate Mechanical Gaming Keyboard, ****ty headset

Yeh it is pretty long my bad. And I was thinking about the z77, do I need to change anything else if I switch to it? And what brand of z77 would be the best bang for the buck? And I already have the hdd and it was a gift from my dad so I'm gona use it but I am indeed going to buy an ssd after I build my pc. And yeh my budget could probably support the 3770k but is there really a difference between the 2600k and 3770k for gaming these days? I mean in the future I can just oc my 2600k and also the money saved by choosing the 2600k I'm going to put towards an intel or crucial 120-160gb ssd. And yeh I might choose 8gb of ram cuz I also have a tendency to close many programs when gaming just cuz I'm used to it. Thanks for the quick reply guys I appreciate it

CPU: Intel Core i7-2600K 3.4GHz Quad-Core Processor
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory
Video Card: EVGA GeForce GTX 680 2GB Video Card
Case: Cooler Master CM690 II Advanced ATX Mid Tower Case
Power Supply: Corsair 750W ATX12V / EPS12V Power Supply
Total: $1182.39

This is probably what I'll settle with, except the gpu could turn out to be a 670 or 7970, and as I stated I have the hdd already and I'm gonna get an ssd soon, any suggestions on what brand? I'm looking for a 120-160gb ssd to go with my 250gb hdd (I don't tend to use that much space), I just want the gaming benefits of an ssd. How does this build look? The cpu will stay the same no matter what as I have a good deal on the 2600k and don't need an ivy bridge processor bcuz I plan to OC my 2600k with my hyper 212 evo.

Thanks on the ssd suggestion, and I think I will upgrade my cpu to an IB, but I was thinking the 3770k, what do you think?

Okay thanks a lot guys, here's how my build looks and what it probably will stay at:

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($189.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.90 @ NCIX US)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard ($129.99 @ Newegg)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($54.99 @ Newegg)
Hard Drive: Crucial M4 128GB 2.5" Solid State Disk ($109.99 @ Newegg)
Video Card: Gigabyte GeForce GTX 670 2GB Video Card ($399.99 @ Newegg)
Case: Cooler Master CM690 II Advanced ATX Mid Tower Case ($75.98 @ Newegg)
Power Supply: Corsair 750W ATX12V / EPS12V Power Supply ($129.99 @ Newegg)
Total: $1120.82

Again, that's not the case I'm getting and I'm willing to spend more on the case now (around $110) since I still have a bunch left on my budget ($1500). I really don't see how I could upgrade this build any more, is there anything really? I'll probably settle with this but I'd appreciate any suggestions cause I do still have a couple hundred left on my budget. Keep in mind that I'm only going to game, no video editing or rendering so an i7 really isn't a viable upgrade.