Wow my last post was a bit garbled.
Personally I would be interested in something that could be proxied as rough riders....because there are very few options out there. Possibly fairly standard looking horses with sci fi equipment, or something cybernetic, or somthing more outlandish other than a lizard.
As for smaller models small creatures which could accessorise a character ie "space" hawks, snakes, vermin type things.
That's just what I am personally always on the look out for.