I mostly have Commodores, but I have some others. First, I've got a TI-99/4a, the first computer I ever used. Looks and works just as well now as it did when new! Also have an Atari 2600 (not the original one I had as a kid, I traded that one for weed when I was a teenager).
As far as Commodores... I've got a few C64 and C128 computers (some are just for parts), a C128D, a Plus/4, and a dead C16. Oh, and a VIC-20 that almost never gets used (I only have like 2 working cartridges and theyre not great).
I'd like to get a few other types of non-Commodore computers some day just to mess around with. Commodore's where my heart is though. I'd like to get a PET and an SX-64 some day.