Where to start.
My first system was an Atari 2600, still have it.
Second was my Commodore 64, still have it
Then a Commodore 128, still have it
Commodore Plus/4 to use at school, still have it.
Then, finally, an Amiga 500 (really wanted the 1000 and now I finally have a 1000). Sold that 500 and got a 2500, still have it.
Then an Amiga 1200, still have it
These systems have been joined by Amiga 1000, 500, 3000, 4000/040, 4000/030 Video Toaster, CDTV, CD32, Commodore Pet 4032, 8032, B128, 16, 128D, SX64
For non Commodore I picked up an Atari 800XL that was used as a teleprompter with the hardware and software. Atari 130XE. Atari 1040STE, Atari 520 ST upgraded to 1MB RAM, TI99/4a. I also have a Tandy 1000HX and an Amstrad PPC640 for old DOS machines and a splattering of old laptops including a 486 Thinkpad 701C "butterfly keyboard".
Of course, now I have a Windows 7 Multicore, multiproc workstation too. My wife hates my basement.