OK, here goes:
IBM PC 8088 @ 4.77 MHz (16KB memory, later upgraded to **64KB, had two 160KB Floppys)
IBM XT 8088 @ 4.77 MHz (loved that 10MB hard drive, also had a 360KB floppy!)
*IBM AT 80286 @ 8 MHz (loaded w/ EGA card, 1.2 floppy, 30MB HD, 512KB memory)
*IBM PS/2 Mod55 386SX 16MHz (hated the fake 32bit SX, but loved the VGA)
*386 33MHz (ahhh, true 32bit, super VGA, soundblaster, nice gaming machine)
*486 DX2 66MHz
Pentium 133MHz
+Pentium 166MHz (laptop)
+Pentium 233MHz (now a dual 233)
+Pentium 2 266MHz
+Pentium 3 600e
+Athlon 1.2GHz (overclocked @1370)
*still have today, +still run today
**hey, Bill said I'd never need any more