If you live near a Microcenter you could save a bundle on that processor and mobo combo.
Edit: I think they are actually running their deal online for the 4th gens
in your future power supply buying ventures, it would be wise to look for something with an 80+ silver or above when you start looking at high end components. Providing ENOUGH power isn't the same thing as providing QUALITY power by any...
It would be Sandy Bridge-E (i7 3820, 3930K etc.) with an X79 chipset, I am not 100% certain the specs compaired to Z87, but I would assume that you would be set for several years without a major bottleneck.
Personally I felt it benificial to upgrade from a 680 to a 780, but i game at 2560x1440, and the extra performance kept me in my target range for fps. Either card will be more than enough for 1080 IMO
I've had Win 8 pro 64-bit for over a year now. The only issues I've ever had compatibility-wise was with older software, but there was almost always a quick workaround with help from google or folks on here.