In a ten gallon, I'd suggest pandas. They are a fair bit smaller than the other species (not as small as pygmies, but definitely smaller), so you can fit more in. One betta and 4-6 pandas would be good. :) The larger ones are a bit too big for a ten gal, IMHO.
As everyone has said, best not to mix species unless you really have no choice (for instance, I got my bronze, peppered and albino as part of a mixed bag, and they live with the single remaining panda from an old school. This is hopefully only temporary, though!)