Brochis splendens for me (I'd love multiradiatus or britskii but they're out of my price range). I like Brochis as mine are much less shy than my corys.
The pygmy cory is probably at present my favorite, have 11 in a 29 gallon, they are fun to watch swim around and interact with each other plus you don't have to have much of a tank to house them in.
ALL OF THEM They have different personalities every type shape and size. I have 48 type 44 breeder groups and I think there all great from albino aeneus to reynoldsai to habrosous and there cousins aspidoras. LOVE EM ALL