Dual 1.2GHz Tbird Palamino on Tyan Tiger MP
1gig Regestered DDR
2x 36 Gig 10k RPM U160 IBMs on AHA 29160 64-bit PCI
GeForce3 (original)
I play 1600x1200x32 Windowed (takes up full screeen anyways, but can alt tab to clicksaver and Mozilla easier)
Built this over a year ago, spent some $$$, but havent had to upgrade in quite a while. SCSI Drives dont hit the CPUs at all when loading in all the textures for the cityscapes so they are free to render the world and do other things. 7200 Delta fans (ugh) work well, but louder than a 747 at takeoff.
Not sure on FPS, its never unplayable tho, and runs quite nicely in trade and entertainment.
Dual boot Debian / Win2k
I love being able to do a "make -j12 bzImage" and only haveing to wait about 24 seconds.