Well, a T25 would work fine as it seems a lot of people keep bigger retics in them with no problem. I just personally like to give my snakes more room if i can which is why i say the T65 lol. Gene would probably be in heaven. Plus you only have two snakes so it's not like Kendra will have to listen you wanting a new cage every year haha. The BP is plenty good in a T10.
After moving that t25 today there’s no way I could move an 8’ cage. IF I go for that length it will absolutely have to be modular. Definitely a two person job to get a t25 packed in a loaded uhaul today