Well Smiley, that greatly limits the varieties, click this link to see the dwarf varieties in the wiki. Click each one to get a description.
Search results - Bananas Wiki The most available one would probably the the D. Cavendish as mentioned above as you can get those at retail stores rather than over the internet or the nursery. I've also seen the Super D. Cav. at walmart as well. There is one other that wont come up on that search, and that is the High Color Mini, which usually only gets to 3 feet. Be aware that some of the dwarf varieties are cooking bananas, or plantains which are nasty raw unless way over ripened (to the point of the skin being black). I hope you keep your house warm in the winter as I hear it is hard to actually get flowers up north, despite what precautions you take. Hopefully someone from the northern states could help out? I hope! Good Luck