i'm guessing from you're GPU that you're a gamer and that reflects on my advice.
In my opinion i think you should upgrade for more RAM and HD space, get an Antec Truepower 550W (it's in my sig) and get a single-core cpu instead. X2's aren't much better for gaming and if you weren't a gamer you'd probably want more HD space anyways.
X2's can multi-task really well but all in all aren't a whole lot faster w/ gaming and stuff...sure you can burn a DVD and play a game while downloading something all at once...but you can burn a DVD and download stuff when you're sleeping/eating/at school...etc
i'd suggest getting a single core 4200 or something around there and get 2gb RAM instead. I highly recommend the PSU in my sig. it's about $80-85 but extremely reliable and will have plenty of power for ya.
Antec NeoPower 650W
Intel Core 2 Duo E8400 (w/ Arctic Freezer 7)
4GB DDR2-1000 G.Skill
Sapphire x1950 Pro 512mb (w/ V700)
250GB, 500GB and 1.5TB Seagate Barracudas (2.25TB total)
Fatal1ty XtremeGamer sound card *** generic TV tuner
Xclio 3060 case *** HannsG 22" monitor
XP Pro / Ubuntu 7.10 *** Razer Copperhead and Tarantula