the 2 setups i spec'd both used 4G of memory, taking a cue from your setup.
if you run 32 bit xp, then you can only realize about 3.5G total... but the 4G will get you there.

i also wanted to use CL3 (didn't see CL2.5) meemory .. as it would be faster.

the 8800CGT is just a solid board...

the case was sort of cool looking (green monster so you can hulk-out) and should be good for cooling

most everything was the saem between the 2 rigs except the cpu and mainboard... amd's are usually cheaper, and i have zero experience with their quad cores. again, a guru should be by to scoff at my meager offerings

as for whether or not these systems could handle 5 boxing.. i'm fairly certain they can. where could you cheap it a bit? tough call... maybe slower memory or lower priced cpu? your call

let us know where you end up