64 bit systems are a little better on gaming. Although on that budget you are probably best to go with an Athlon XP.
Heres an ideal:
130 AMD 2800+ XP
110 Gigabyte 7n400Pro2
180 1 gig of RAM PC3200 CL 2.5 (Dual Channel)
60 80 gig 7200 RPM WD
300 Geforce 6800
60 Case
These are prices from my local computer store, so you could probably do a little better online, that should keep you right about your budget. You could maybe get one 512 stick, or maybe 2x256 (to keep dual channel). Also a 2500+ chip would also save you some money, and could overclock it to 3200+ speeds no problems.
A card like a 9600xt, or maybe even a 9800Pro could bring the price down a little more also.
Of course depends on what kind of games you play, would newer games be on that list, like Doom3?
My Desktop: <A HREF="http://Mr5oh.tripod.com/pc.html" target="_new">http://Mr5oh.tripod.com/pc.html</A>
Overclocking Results: <A HREF="http://Mr5oh.tripod.com/pc2.html" target="_new">http://Mr5oh.tripod.com/pc2.html</A>