I'm using a PCChips motherboard (LMR571 I think) with a Cyrix 200. Seems to work fine for me. There are a few things you should know about PCChips motherboards:
1. They are not the highest quality motherboard in the world, but are decent with an excellant manual
2. They require a power good signal
3. The onboard sound has a bizarre impedence which may pose a problem for your stereo or head unit
4. The onboard modem does not work with Cyrix chips (probably not a big deal).
Other than that, there isn't really a problem. The BIOS is highly configurable and supports all modern functions. The board comes with high quality cables with built in latches, and warrenty support seems good (I dropped mine and had it replaced on RMA).
London, Ontario, Canada
Player: Cyrix 200, 32MB RAM, 10.2Gig Quantum HD, Onboard EtherNet/Sound/Video, Custom Lexan Case, Arise DC-DC, Win95 Kernal w/Custom Player
Car: '86 Mazda RX-7 w/Basic Performance Upgrades