GPU: R9 270X 2GB < This is AMD but if you want NVIDIA go with MSI GTX 950 GAMING 2G Graphics card - 2 GB - GDDR5, If I had to rebuild my pc I would go with the NVIDIA TBH just for the shadow play.
PSU: Thermaltake 730W
Motherboard: MSI Z67-G43
CPU: i5 4670K Quadcore
RAM: G.Skill Sniper F3 16GB ram 2x8GB
You need to get a case, a hard drive and a DVD player, can link those if you want the same as me, I get a constant 60 on PERP, 500+ on CS:GO depending on res and settings.