Whats up Justin? Didnt know you came here.
If you seriously want an ENTIRE gaming PC for ~600 youre gonna have to cut serious corners. Heres what I did with $650 (yea I went over, and I also grabbed a case, CDRW and PSU):
ALL PRODUCTS CLICKABLE FOR LINKS TO NEWEGG ITEMS.
ANTEC Black Performance Series II SOHO File Server Tower ATX Case with 400W Power Supply - $92.00
CD Burner Combo Drive
Lite-On Black 48X24X48X16 Combo Drive - $46.50
Mitsumi Black 1.44MB 3.5inch Floppy - $11.00
Western Digital Special Edition 80GB 7200RPM IDE Hard Drive - $71.00
Crucial 184 Pin 512MB DDR PC-3200 - $84.00
ABIT nForce2 Chipset Motherboard Model "NF7-S" - $100.99
AMD Athlon XP 2500+ "Barton" - $80.00
Transcend ATI RADEON 9600XT Video Card, 128MB DDR, 128-bit, DVI/TV-Out, 8X AGP - $158.00
Subtotal - $643.49
Total (with shipping to Washington) - $668.49
Theres no way to get a decent gaming PC with $600. This is the closest thing youll get to it. The motherboard has built in LAN so no NIC card is needed. The onboard sound on the NF7-S is also apparently pretty good so I say wait till you can afford a decent sound card and spend that cash now on other things.
Any questions ask away.