1st gaming build plz help

Hey guys..
I am rebuilding my a PC and it is for d 1st time m doing it myself..Really want the help of u guys..

I need a CPU,MOBO,GPU,RAM and HDD
This is what I have decided..

CPU-AMD Athlon II X3 445

MOTHERBOARD-MSI 785GM-E65 or Gigabyte GA-MA785GMT-US2H

RAM-Corsair DDR-III Memory 4GB [2 x 2 GB] 1333Mhz

Graphics Card-ATI Radeon HD 5770 512MB (please sugest a good vendor in India)

Hard Drive - Seagate Barracuda 7200.12 500GB

My main purpose is gaming(GTA IV,Prince of Pers,COD,Crysis,NFS Shift Assassins Creed)web browsing and movies
Will i get playable FPS
Since m a 10th student so budget is very tight
Thanx in advance 4 ur help