I be having it in my greenhouse in a pot.
Then you need to go dwarf, so Dwarf Namwah.
Well the greenhouse is 12ft tall and i can make a big pot.
the red abyssinian (ensete maurellii) is my favorite. The huge leaves and the coloring can't be beat!
Well i want a banana that has the best fruit.
12' of greenhouse gets you about 7-8' of trunk, and 4-5' for leaves. So that still leaves you with a dwarf variety.
Perhaps a dwarf cavendish would work for you? They are tasty and not too tall. Williams are tasty, but they get pretty tall.