the T3 3x2x1 is a great size for adult bp's.
most people go with the T8 4x2x1 , its cheaper but not too big and being dividable you can put 2 adults in one cage
T10 same as T8 just a bit taller
i have my T8's in the basement they were too big to keep upstairs in my computer room. i should have ordered the T3's
but im happy with the T8's
just mho....kirk