Which CPU

Go with Intel Core i3 3220 3.3GHz 3MB BOX.

FX 6100 is really BAD for Gaming.

intel.

Thanks guys.

Now which power supply should I take with this setup?
XFX CORE EDITION PSU PRO 450W or CORSAIR CX-500W 12CM BUILDER SERIES V2 80PLUS, they have the same price.

Intel Core i3 3220 3.3GHz 3MB BOX
ASUS P8B75-M LX INTEL B75 SK1155
G.Skill Ripjaws X DDR3 2x4GB 1600MHz CAS9 1.5v Low Voltage
Seagate Barracuda 500GB SATAIII 16MB (6GB/s)
XFX ATI RADEON HD7870 CORE EDITION 2GB GDDR5 PCI-E
Sony DVR 24x DLayer Sata Preto Bulk
Cooler Master K350 - USB 3.0

Corsair. More efficient and more headroom.

Thanks for your opinion  

Always glad to help  

For $20 more you could get an FX 6300.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The place where Im buying hardware doesn't have fx6300