Too be honest, I would go as cheap as you can. Thats still a good RTS lan box, starcraft will always run nice

But since your truly LACKING in horsepower for the vast majority of todays games I would go as inexpensive as possible.
Things I would recomend that you dont have listed though would be a 16Meg Banshee card. or a voodoo3 2000, both of these cards have good 2d quality and can do Glide games respectable on that system in 16bit color, I used to play UT and half life on a system very similar to that with a monster fusion 16meg (banshee) and it was really quite enjoyable.
But I wouldnt put much better then that in there. sure a Geforce3 would be nice too many other things are holding you back. its only going to bas fast as the slowest part
