Depends on how much you want to spend, what tankmates and fish you wanna keep etc... But a tigrinus or jurense cat would look nice. Or go for a nice larger pim such as ornatus, i have one and hes gorgeus. Maybe a moderator will move this into the catfish section cos you'll get more replys.
A nice school of pim. pictus would look great aswell! I know that they arent catfish but clown loach look fantastic in a good sized group and have heaps of character. A nice sized group of brochis splendens with a few corydorads would look good too!
if u center it around the cat and u have the money i would get a tig. tankmates have to be big enough for it not to eat. i never had problems with cichlids being aggressive toward my catfish but i dont know about other people so u may wanna check that out too.