My 2 cents.
Sell your current CPU, motherboard, RAM and graphic card, that should get 5-10k.
Now we have around 20-25k.
Get,
AMD 64 3000/3200 AM2/s939
Asus A8N E s939 or a decent AM2 mobo, not M2N E, it is crap
2 X 512MB DDR 400 / DDR2 667 RAM
Spend the rest on the graphic card.