doesn't support triple core or quad core right now but in the future it would be wise to get the quad core and overclock it with a good cpu fan to 3.2ghz
Most current games support 3 cores. Select games like FSX, GTA4, Dragon age and BFBC2 support 4+ cores. Stop living in 2008.
Your best bet right now is the triple core. But I wouldn't dish the dual core because it has the highest clock and the addition of L3 cache. Just depends on what games you play. I would only go for the x4 if you play those select few games that really need the extra core.
I have an x4 myself, OC to 3.22GHz. If I could do it again, I would get the x3, and try for a higher overclock. Then again, I also plan to replace my current CPU next year so having a quad for the future is irrelevant to me.