It sounds like a wonderland. You forgot something else... Photos or it doesn't exist.

Of the groups of garters you list, I'd put the male pickeringi in there. I wouldn't put the vagrans in, and I think I'm right to say that a male Puget will top out larger than the ordinoides. Eventually you can put a couple of male radix or infernalis through quarantine and in 3 months you should have room to pop them in there too.