You should be able to get a fast Athlon (1.2 Ghz from NewEgg) for about $120, a good heatsink for about $40 (Taisol 760092), a new motherboard for about $130 (Epox EP-8K7A, again from NewEgg) and 256MB DDR RAM from Crucial for $60. Totals out to $350+ s/h and you'll end up with a smoking fast system. Take the $50 and put it towards your "get me a new videocard" fund. Once that reaches about $140 you can pick up a GeForce 2 PRO 64 MB (MSI StarForce 831 @Newegg) and you'll be even happier, if you do any gaming.
- G