I use the mostly for gaming. It was my first build so it took me a while (2h-2h30m) and involved some OMG WTF happened moments but it was worth it and wasn't as hard as expected. So, quickly I will run through why I picked some of the parts:
AMD FX 8320 Black Edition* - Awesome bang for my buck, wanted an 8350 but couldn't afford it and also I plan to overclock later on, as all AMD FX chips are unlocked.
ASRock 970: Again, great bang for my buck and feature-rich for the price.
MSI Radeon 7850 2GB : Awesome card for the money, MSI make some of the better ones.
*Black Edition was not listed in PCPartPicker list