How about my board?
Abit KT7A V1.3, KT133a, supports all Athlon XPs (even >3200+), has 6 PCI and 1 ISA slot together with AGP 1/2/4x. Tried it in DOS w/AWE32 and of course it works flawlessly.
Its the best and newest ISA slot board out there and its 3dfx-friendly too 😀 Equip it with 1.5gb RAM, a mobile barton, few hard drives in RAID and you got yourself a computer that can run everything from DOS to Windows XP 😉 The only downside is that its too fast for some dos games. But for those ones there is DOSbox, which is running pretty damn good on this CPU, and MIDI is still coming from AWE32 (or daughterboards/Rolands)
Edit: of course, if you are less of a freak like me, you can just as well plug in an el-cheapo duron/athlon 500-1400Mhz which also works quite good. Maybe even a tbred B on a lower voltage, so you can run it with passive cooling.