-Intel 486 DX, on a crappy machine with 4 mb ram, whitout soundcard, which both where bad things at the time I finally got m.
-Intel pentium 2 300MHz, on a good machine with a crappy 4mb gfx card.... and a Roland Rap10 soundcard which didn't like windows
-AMD 1200MHz T-bird with its 133FSB which I could overclock to 14xx (first pc I choose the components for)
-AMD Barton 3200+ which somehow couldn't over or underclock a single MHz.... (which often ran at 79C but didn't die on me ever..)
-Intel Celeron 1.3 Mobile, wich still runs great in my Dell inspiron 6000 notebook and is OC'd to 1700 bij a Pin-mod (fsb 533 to 667)
-AMD Phenom II x3 (which is unable to unlock it's 4th core and runs stable) but is OC'd to 3.5GHz (NB at 2.5) on a cheap arctic cooling Freezer64 and never runs hotter than 51 C...
hmm though choice Think th T-bird and Phenom have to be my favorites, just because I can tweak as much as I like with those systems