I'm just hoping to make sure that all of the parts are compatible since I'm a first time builder. Also any tips when building would be nice too.
Asus Sabertooth 990FX MotherBoard
AMD FX-8150 Zambezi 3.6GHz Socket AM3+ 125W Eight-Core
SAPPHIRE Radeon HD 7850
Rosewill Challenger tower
Kingston HyperX 120GB SATA III SSD
CORSAIR Vengeance 16GB (4 x 4GB)
Rosewill Green Series 630w
These cards will be around $300-400(and some change if 680) range. There's not "too much" difference between them I personally am using an Sapphire HD 7970 and loving every minute, OC very well along with being cool and quiet and one of the best single GPU cards out. Usually the argument is driver and/or nvidia - ati fan boy based. What it comes down to is the games you play and personal preference.