What do you have to play on now?
Reason I ask, is it's not the best time to build. You'll get best bang for buck gaming wise if you wait for Skylake and build an 1151 platform rig based on the Z170 chipset, the new more affordable dual channel version of DDR4 RAM that will be available then, and a Skylake CPU.
Or, if you want to use this for both gaming and work or heavy tasking like video encoding, you could spend a lot on X99 platform. I don't feel it makes much sense to blow $300 on an 1150 MB just for gaming though.