It really depends on your use. If you are a gamer and a overclocker the FX4100 is easiest to get added performance from. If you are a multitasker and you do editing and rendering the X6 1045T is the best performer.
Brett stop! You are lucky nowadays if you can get a used one for less than a new I5 2500K!
http://www.ebay.com/sch/Computer-Components-Parts-/175673/i.html?_nkw=amd+phenom+ii+x6+1100t&rt=nc&LH_BIN=1
Hi
I saw them being sold retail in the UK last week for £120....NEW....not sure why US prices are so high...?