Read https://www.reddit.com/r/PCMasterRace/wiki/builds and see what they are using today.
Specs:
Case: Phantom 410
Motherboard: Gigabyte GA-970A-D3P.
Current CPU: AMD FX-4300.
Graphics Cards: Two R9 280x cards running crossfire.
RAM: 8 gigabytes.
Hard Drive: WD 1 TB.
I am currently looking to get a CPU (and a CPU fan) for about $250 but less if possible. I was looking at the AMD Black Edition FX-8350, but i'm not sure if I have enough clearance for the subsequent CPU fan upgrade. Thanks!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic