hi, i voted other. personally, i'd get some kuhlis and some corys, but not the pygmy corys, i'd go for something a bit bigger. i have kuhli loaches, and they are active, constantly sifting through the sand, which is fun to watch. when i first got them, they didn't come out much for the first few weeks, but after a while they got more active. i got 6 at first, then added another 6, which definitely made them more active. i would get about 10 kuhlis.
i would go for either panda corys or C. trilineatus, but that's just personal preference. make sure you get at least 6 so they are more active, and get all of the same species, as they prefer to be with their own species. i think that the panda's may be better for you, as they are active, and quite small, and great fun to watch. however, i don't see a problem with getting the pygmy corys. they are really cool, and swim around the middle of the tank more, instead of nearly always being a the bottom like the other corys. i'd get a bigger shoal if you were getting the pygmys, as they are smaller so you can fit more in the tank, and the more you get, the happier they'll be.
what substrate do you have? as both corys and kuhlis much prefer sand, but will be ok with small rounded gravel. however, you shouldn't keep them if you have sharp gravel, as it can injure them.