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In September I'll be ordering the first stage of my build, the rest will come in January and I had a few questions about my watercooling setup and what motherboard I'll need to get my overclocks where I want them. I'll be using the computer as our primary work station, my wife and I run a gaming youtube channel and stream for the Smite official twitch.tv channel, so I'll be doing a LOT of video editing, photoshop, recording and streaming as well as gaming.

Money isn't exactly no object as we'll be building this with our scholarship/student loan money, but we have about a $3,200 MAXIMUM budget in September and an additional ~$1,500 in January (with at least 500 of that going to a 2560x1440 monitor).

Parts for September:
CPU: 4770k
Motherboard: ASRock Z87 Extreme6
GPU: EVGA GTX 780 Classified w/ Hydro Copper cooler
Ram: Corsair Dominator Platinum 1600 DDR3 16gb (2x8gb)
PSU: Cooler Master V1000 1000w
SSD: Samsung 840 Pro 256gb (Primary & Rendering drive) & Samsung 840 250gb (Secondary & Recording drive)
HDD: WD Black 1TB 7200rpm (We also have 4tbs of network storage)

Watercooling:
Radiator: Alphacool NexXxoS Monsta Quad 140mm (Externally Mounted)
CPU Block: EK Supremacy Universal Full Nickle
GPU Block: Preinstalled Full cover Hydro Copper
Pump: Swiftech MCP355 DDC w/ XSPC Laing DDC top
Reservoir: EK Dual Bay w/ Flow Meter
Tubing: 1/2" ID, don't know what kind yet.
Fans: 8x Cougar Vortex HDB 140mm

Parts in January:
2nd GPU: EVGA GTX 780 Classified w/ Hydro Copper cooler
Ram: Corsair Dominator Platinum 1600 DDR3 16gb (2x8gb)
2nd Radiator: Alphacool NexXxoS Monsta Quad 140mm (Externally Mounted)
2nd Pump: Swiftech MCP355 DDC w/ XSPC Laing DDC top
Fans: 8x Cougar Vortex HDB 140mm

I've been doing as much research as possible but I've ran into some grey areas in both watercooling and overclocking.

On overclocking, it looks like the 4770k is a total dice shoot as to what you can do with the processor, so I'm setting what I think is a realistic goal of getting a stable 24/7 4.5ghz processor when I dellid the thing and apply some Coollaboratory Pro/Ultra. My question then is if the motherboard will really make that much of a difference there. I'd like to have it stable at as low voltage as possible and I'm unsure if putting an extra 50-100 bucks into the motherboard is a good idea. I really don't like the idea of a $300+ motherboard as I won't be benchmarking, at all.

As far as watercooling goes, I'm really wanting to get to a DT of 5-7 with my fans running at a max of 1000-1400 rpm in push/pull. I'm thinking that I've already got overkill on my radiators when I have 2 alphacool 560 monstas. Would I be correct in assuming that or do I need more? Second, I'm pretty set on going with these fans, not so much for the performance, but for the price, 8 of them will only cost me $125 where as their competitors will run closer to $200 for 8 unless anyone knows of better contenders in that pricing ballpark.

I'm also wondering if I'll need the second pump in January and if the pump's I've selected are actually the best bet or should I go with a MCP350 instead?

Lastly, anyone have any ideas on external mounting of these radiators? I was thinking of fabricating a stand and just have these sitting off to the side of my case on the end table I set my pc on.

Thanks in advance.