Oooh, macfarlanei would be great in a hanging basket.
Here's why:
(Thanks Mr. Danz)
I've had one for a while, they are very colorful and pretty. I don't have it at a very large size, so i can't say anything about that, and i haven't found to much about that on the net either.
Stenophylla is new to me too, but i can safely say they are beautiful. I've also heard that they get to a decent size, and grow kinda slowly.
Copelandii is cool, it grows at a medium pace, and is almost insectiod in color. The upper pitchers are smaller, less colorful, but still pretty.
Bongso is also new to me, but i think they get to a decent size, and are very colorful, the uppers are less colorful, but from pictures i've seen, they are still cute. I think they are also a bit slow growing.