To me there is nothing wrong with a phenom ii x2 555 cpu, heck i played crysis 1 on high and very high mixed with a gt 430 (using 800x600 rez xD) and still get very good fps
plus if you get the right mobo like a A770e3 (one that has an SB710 chispet) you can unlock two extra cores. I have mine running on 3.2ghz (per core) htt set at 1.2ghz vcore on 1.41volts, NB st on 1.28volts and ACC enabled using stock cooling, (still stable using it now) ITS JUST SO FAST!!!
also i paid 90 bucks for it (newegg)
even if you can't unlock to two cores its still a good cpu to play games (3.2ghz dual core?! 90 bucks free shipping??!!! (newegg) its like they are just handing this out to people.