Honey's and sparkling are actually some of the smallest gouramis you can get. I would pick those over the dwarfs, since most people like keeping only one to such a small tank to make sure there is no fighting between them. From what I understand, the dwarf gouramis sold in lfs are for the most part, males, and male dwarf gouramis tend to have territory issues in tanks that small.
I've never had sparkling gouramis myself, but I hear nothing but good things about them. Very attractive, active fish.
I'd advise against platys for ten gallon. In my experience with them, they always seemed more active and happier when I had a nice group of them (four or five females to one male). I use to have two female platys in my community ten gallon, and they just never seemed as active as the group in my 65 gallon community.
I HIGHLY recommend the corydoras hastatus/habrosus or pygmaeus. Very cute, active fish. There are also some very small rasbora (I can't remember the name right now), but I've heard many people speak highly of these as well.
Honestly, you probably want to stick with fish that stay around an inch. I think this allows you to stock a few more fish than if you went with something like mollies (which, reallly, can get up to four or five inches -some more)