My apologies I was thinking about a tig. Both the clown and aero would work but you would have to worry about the areo jumping. Shouldn't be a big deal to keep it covered sense you will most of the time to keep the heating bill down. As for the other cats id suggest
ID shark
http://www.planetcatfish.com/catelog/species.php?species_id=172
A very active fish so it'll add activitiy during the day.
Oxydoras niger
http://www.planetcatfish.com/catelog/species.php?species_id=37
Flat head catfish
http://www.planetcatfish.com/catelog/species.php?species_id=262
They can live in temps up to 76-78
And channel cats, I would stay way from jau, and Indian shovelnose sense they are both pretty aggressive