My synodontis. I have many many different species of syno and love them all.
I also adore my loaches and recently bought 3 green tiger loaches, currently living with my large red finned blue loaches and a yoyo loach. Really fun the yoyo and the tigers, the blue's aren't as active. My clowns live in a different tank but are super and like to sleep out in the open.
P.
i would love to try catfish again, but after my panda corys kept getting sick, im afraid too. i think i may just go buy a bunch of ghost shrimp and stick to them as my bottom dwellers