Athlon II X4 640 Propus vs Phenom II X2 555 Black Edition

Hi this is my first thread on hear and i have question I've been pondering for the last 2 weeks.

I'm building a new pc from scratch minus the disk drive and hard drive that im binging over form my current computer. here's my current build plan.

COOLER MASTER HAF 922
ASRock 870 EXTREME3
HIS H577FK1GD Radeon HD 5770 (Juniper XT) 1GB
RAIDMAX HYBRID 2 RX-730SS 730W
G.SKILL Ripjaws Series 4GB (2 x 2GB) DDR 3

so as you can see i have yet to choose a cpu. Im looking for one under $100 because this is a budget build. I like the Athlon II x4 because its a quad with a lot of power at $99 and i like the Phenom II x2 because its also powerful AND it can potentially become a quad. My mobo can unlock cores so i know that i have a chance at it.

This pc will be a mostly for gaming. I do plan to try over clocking the cores. i will surf the net on it but thats not taxing. So any ways which should i go with? the quad core or take a chance and possibly have a more powerful quad core.

Any advice is much appreciated.

Personally I stick to purchasing a true quad over attempting to unlock cores, the dual core would be wasted if it failed to unlock. I literally would go buy a quad afterwards.

oh also does the athlons OC well?

if i was successful at unlocking both which would i see better performance out of on games?

hmmm well i think ill go with the athlon... im also going to see if maybe i can squeeze a little more out of my budget and maybe get the AMD Phenom II X4 955 Black Edition. its $144 is it worth the extra $44 for gaming?

^+1