Neah. Leave out the gouramis. Those guys get crazy in small spaces...
A pair of Fundulopanchax garderi or Aphyosemion australis killifish would do well in there, and those have personality.
Or... if you're willling to feed small amounts of live food every so often, go with Dwarf Puffers. These guys have personality out the wazoo--much more than cichlids, even! 3-4 would go very well in that space. But you would without a doubt have to feed them live black worms and/or brine shrimp once every few days. It's really not that gross once you get used to it.