This was for the main system. I shuffled some of these down into secondary systems as I upgraded. Starting with my 8MHz Mac SE:
M68000, 486DX4-120, P166MMX, Celeron 300A, PIII-650 Coppermine, Duron 1GHz Morgan, AthlonXP 2200+ TBred-A (bad choice), Athlon XP 2500+ Barton, Athlon64 3200+ Venice...