Help me build my GeForce GTX 1080 new PC Rig

[JEMC]

More than waiting for benchmarks (let's be honest, it will be the fastest GPU available until the next round ships at the end of this year or early next year), I'd wait until demand settles a bit and prices approach the MSRP. Another thing is if you want the best price/performance card which will most likely be the GTX 1070.

Chassis and CPU cooler depends a bit on your preferences: if you prefer quiet/low noise components you have some options, butif you prefer cooling/performance over everything else you have other options.

With that CPU and a new GPU, a PSU of less than 650W will be more than enough, even for two cards, but use good brands like Corsair, Seasonic, for example.

For storage, a 240/256GB SSD plus a regular 1TB HDD should be enough, but a 512GB SSD and a 2TB HDD would work better. Just remember than games are getting bigger and bigger so, unless you plan on keep installing and uninstalling games as you complete them, set your Steam (if you use it) to your HDD and not your SSD.

Lastly, what size do you want that monitor? And do you care about color reproduction or prefer fast response (meaning IPS/VA vs TN monitors).