Someone just lost 30 neons to some angel fish, this is not a good idea. Gouramis are a fine fish, but be careful, as they will fight among themselves (depending on all sorts of circumstances).
And any idea about cleaner fish?
As long as you know the cleaner fish will only eat left over food, there are many choices. I love the small varieties of plecos--clowns, rubber lip/face, bulldogs. Cories are also a good choice. If you need an algae keeper, that's a different story