Hm...
TI 99/4a
Apple 2e
Apple 2gs
Amiga 500
486/66 (that one lasted a long time (too broke to upgrade)
cyrix 586-120 (came defective, lasted 1 week)
cyrix 686-120
cyrix 686-166 (didn't learn my lesson the first time, cyrix sucks)
k6-200
k6/2-300
k6/3-400 (great system)
P2-400 (don't know why, hadn't built a slot 1 board yet, expected to only keep it a few months, ended up having it nearly 2 years
duron 650@850. (on a abit kt7 raid, best moboard I've ever owned)
Next: Dually tbirds/palaminos...