If you're happy with the current performance of your system; I.E. if it does everything you want it to do, then I'd just leave it as is. If you do a lot of video and Photoshop work, then the Q9550 would probably be worth it, but most games don't benefit from quad cores yet. You could always just hold out for a year or two and upgrade to i7.
------------------------------DFI nF4-DAGF
A64 3700+ @ 2.25GHz (11 x 205)
2GB G.Skill DDR400 @410
ASUS Radeon HD 2600XT 256MB
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