Right off the top of my head, SMS and VB... tons of dedicated pong units I can't name... Tg16, TurboDuo, TurboExpress, PCE, LaserActive... Saturn... Dreamcast...
...not sure if you count revisions, I generally don't but probably have every revision of most consoles. Definitely have SMS 1 and 2, all revisions of the standalone Genesis, tons of variants of the 2600...
I used to actively collect console stuff pretty hardcore, but not so much since I have gotten into arcade cabs and pins.