what i'd do is get an Athlon XP, 2500+ is prolly best value (just a few bux more than a 2000+), and get a fairly descent (but not too expensive) mobo from Gigabyte or Asus so they wont screw your PC, then a fairly inexpensive video card (but not a cheapo one) like a Radeon 9200/9600 or Geforce FX 5200/5600 and 512MB RAM, and maybe try and find a good deal on a 20/30/40 gig drive at a swap meet, and add it to your 9 gig
these 4/5 things will end up being less expensive than a new PC, and your PC will end up performing a lot better.