For a pure gaming box, Win98 SE is the way to go.
Win2k Pro is a sweet OS though. I run it on my server here at home and I run it on my workstation at work which I game on as well. Lately every game I have tried in Win2k has worked perfectly, and with DX 8.0 the speed is almost as good as Win98. I would recomend 256 megs of RAM to run Win2k, but it runs really sweet with it. Anything more is a very small gain, not really worth it. 256 is the sweet spot for Win2k Pro.
If the USB controller issues were solved I would be running it in a heartbeat on my gaming rig.
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Lephturn - Chief Trainer
A member of The Flying Pigs
http://www.flyingpigs.com "A pig is a jolly companion, Boar, sow, barrow, or gilt --
A pig is a pal, who'll boost your morale, Though mountains may topple and tilt.
When they've blackballed, bamboozled, and burned you, When they've turned on you, Tory and Whig,
Though you may be thrown over by Tabby and Rover, You'll never go wrong with a pig, a pig,
You'll never go wrong with a pig!" -- Thomas Pynchon, "Gravity's Rainbow"