I agree with your opinion on the 430TX chipset, z180. The Gigabyte board I have in the K6/266 has that very chipset, and I'm most impressed with it. I've owned quite a few Socket 7 systems over the years, so I'm no stranger to them.

Anyway, I've been playing with the Pentium 133 a bit, gave it a complete teardown and dusting - damn the thing was dusty inside! Every single part in it was caked in dust. While I had it in bits I also installed another two 8MB SIMMs (the board only has 4 72 pin SIMM slots, no support for SDRAM), and dropped in a Pentium 200. Machine runs a lot faster, although it now freezes up and reboots randomly. I'm thinking something might be up with that RAM...