Well, the 2001 is a PAL clone of the 3000. Technically the 3000 is a redesigned 2000. So I don't have a 2001. If I ever find one in the wild, I'd probably buy it. The 2100 is an expanded PAL version and I own that model.
I "should" have all the rest. Part of the reason for this forum is to organize the pictures and see what is all in the current inventory of systems I own. Once I have everything established I'll move all the pictures to a proper page where folks can flip through them. That'll be a long time from now though. I still have a lot of photos to put up and boxes to dig through. And I need to take a lot of retakes since so many pictures didn't come out. (Blurry lens)
I "should" have all the Telstar systems as well. Including the rare Montgomery Ward system. There was a fleet of these made as well.
Some notable things I am missing include Atari Pong. I had the Tele-Games clone of it, but it was destroyed in the great kitchen flood of 1997. I also don't have a Neo Geo Cartridge System or Neo Geo CD system. One day I'll bite the bullet and buy one. There are so many in the wild it has never been a priority to get one. And my Laser-Active is broken. I do still have it and maybe it can be repaired, but I'd really like to claim one in working order. I also don't have a Wonderswan or a GamePark.
That is in no-way the limit of systems I'm missing, but those are all high profile items that I should have, but currently do not.