With that much RAM? Windows 2000. It stands to reason that if you bought the memory, you might as well be able to use it effectively. Win9x can't ... Win2K can. It's as simple as that.
Win2K will play nearly any modern game, if installed and configured correctly. It might not benchmark quite as fast as Win9x, but the games will play just fine. And the additional stability of the OS will make up for any minor drop in FPS, regardless.
Win98 is slightly faster with games, but not enough to justify keeping it on the hard drive unless you intend to play much older games, IMHO.
Toejam31
<font color=red>My Rig:</font color=red> <A HREF="http://www.anandtech.com/mysystemrig.html?rigid=6847" target="_new"><font color=green>Toejam31's Tantalizing Tantric Toy</font color=green></A>
<font color=red>Second Rig:</font color=red> <A HREF="http://www.anandtech.com/mysystemrig.html?rigid=15942" target="_new"><font color=green>Toey's Dynamite DDR Duron</font color=green></A>
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<font color=purple>"Procrastination on your part does not constitute an emergency on my part."</font color=purple>