On the other end of the spectrum, I love my little S. American Bumble Bee cat, I just wish it would come out more often, another common issue with cats. Pictus Cats are pretty cool, don't get too big, and always active.
Everyone has their own definition of cool catfish. The ones that I can keep due to space are Raphael cats spotted and stripe, Pimelodus blochii's. If I had the space and $ I would love to have a juruense, vulture and Pimelodus ornatus.