My Garbage Computer

Dear /g/, I have a question. Several actually. I'm looking at upgrading my computer, but with it's current stats as follows, I'm wondering if it's just better to scrap it and build a new one:
Athlon XP 2800 (sucks)
Radeon 9600 (also sucks)
512 M Ram (utter shit)
240 Gb HD space (plenty)
DVD-RW (fine too)

So, with a generally crappy motherboard (No pci-e slots) What would you reccomend to get this hunk o' junk up to high-end gaming speed? How much would it cost?

>>4 is a whiner

You aren't hardcore until you've used a 120mhz piece with 2mb onboard video and 57mb of ram for twelve years.