Instead of just asking the same fing question over and over despite people answering the question, why don't you just wait another month, save up another $150, and get both a dual core and an X1900XT.
You will want the dual core in the next 6 months and you will want the X1900 as well.
Can you game well now with a single core and a good video card. Yes. Will you game as well in 6 months. No. So unless you work on a 6 month upgrade schedule get the dual core and the X1900.
I've been saving for four months, i don't need ot save any longer for a $150 upgrade that I wouldn't need, hence me asking the same question over looking for a real answer besides "SURLY YOU MULTI TASK DOOD I MULTI TASK THAT MUST MEEN U MULTI TASK TOO LOLZ!!11". So how about you read my posts, read the other posts, and start making sense, smartass.
I still don't see why I should get dual core if I am going for pure gaming, as others have said, and there doesn't seem to be any real bonus in getting a dual core for gaming, besides future games supporting the multi threading, and still no evidence on how much it will support or what kind of bonus it will provide, so why will I want the dual core in 6 months? Sure, it'd be cool to run everything + a game, but since I don't need it and i tend to close everything before I run a game anyways, I don't see why I should get it if there's no significant bonus.
Now if you want to send me $150 then I'll gladly purchase the dual core, if not, keep your rude comments to yourself. thanks.
p.s. thanks for all of the suggestions, i think i'll go single since processing doesn't benefit gaming (as far as I see) even close to a better GPU from a good GPU.