Or sidthimunki loaches, for that matter. =] They only get to, what, 2 inches max?
I would personally go for a trio of badis - they are amazing fish! They're from the same region, have great personalities and are genreally quite peaceful.
Pity, banded gouramis are my favourite species!
You could try pearls, moonlights or three spots. Male threes spots are a tad aggressive to other three spots, but the females are fine. :)