I've decided on the 3rd card aCb mentioned.
The hard drive just kinda died on it, so that needs to be replaced. I took a 400 watt power supply from a different PC that didn't need 400 watts and traded the 300 for that one. I also decided to upgrade the processor while I'm at it to a P4 3GHz.
I can make up the cost of this stuff from birthday money and selling my older 700 P3 and 600 Celeron systems once I get them up and running, along with a 1.7 Celeron maybe.
ASRock P4M890 (already have) - http://www.newegg.com/Product/Produc...82E16813157106
P4 HT 3.0GHz (will buy) - http://www.newegg.com/Product/Produc...82E16819116027
512MB DDR 400 PC3200 (2x 256) (buy 256MB stick, already have 256) - http://www.newegg.com/Product/Produc...82E16820145478
Western Digital 80GB SATA (will buy) - http://www.newegg.com/Product/Produc...82E16822135106
EVGA Geforce 7600GT 256MB (will buy) - http://www.newegg.com/Product/Produc...82E16814130062
400 watt power supply (already have)
Is the P4 processor worth the extra money, or should I stick with the 2.8GHz Celeron? I was just thinking of selling the Celeron on craigslist after getting the P4. If I get the P4, how much might the Celeron be worth?