HELP, I CANT DECIDE WHICH BUILT?

OK, so Ill be playing games like GTA 4 and Empire Total War as well as future games, so what do you guys think, which one is better (I play on 22" by the way)

1)
AMD Phenom II X3 720
Biostar TA790GX
OCZ Blade PC8500 1066mhz 4GB
Ati Raden HD 1GB 4870
PC P&C 610W
Antec 900
WDC blue 160GB
LG GH22NS30 22x DVD-RW
Windows 7

OR

2)
AMD 940 BE
ASUS M4A78T-E
OCZ platinum AM3 1333mhz 2x2GB
ASUS 4850 512MB (this because it saves me £50 from getting a 4870 1GB and OC'es to 800mhz) (I might get another 4850 512mb later)
Antec 900
PCP&C 610w
WDC blue 160GB
LG GH22NS30 22x DVD-RW
Windows 7

thanks for the quick reply. Ill proobly go quad and because the 4850 isnt expensive it wont be long untill i get another one