Kudos on getting rid of the glass tank. They are a husbandry nightmare.
Balls don't need much space at all, in fact they are frequently found balled up in the tiniest space available.
Tubs are opaque so privacy loving BP's are usually at home in them, but most breeders use stackable tubs and rack systems to save on space.
You are not selfish, you love your animal. Go ahead and get the T8 or T10. Just make sure it has plenty of hides and clutter for your secretive BP.
David