My little list:

Sinclair ZX81 with the wobbly 16K RAM pack
Dragon 32 (ugh)
TI 99/4A (with the voice synth module... v.cool)
Amiga 500, with the 50MB SCSI drive and a whopping 4 MB of RAM.
A long hiatus.....
P90
PII 450
Current system: Athlon 1200 lots of RAM, GF3, 4x40Gig 7200's in RAID0+1.

At work it went something like:

8MHz 086
12MHz 286
20MHz 386SX
25MHz 486SX
100MHz 486DX4
P133
PII 450
PIII 900
Still waiting for a Poo4.