A male dumeril's boa or madagascar ground boa? The MGB is much more uncommon to find, but I think it's super neat to own a more unusual species. A ball python with hides and stuff would be super comfortable in there too. You'll want to find a mostly terrestrial species, since the cages are low.
Bredli's are semi-arboreal. 4x2x2 minimum for them generally, from what I've seen!
Unrelated, but you have so many corn snakes! :0