I agree if you want black skirts they should be in a group (I would think more than four), and that will limit other type of fish you can have. If you really want a gourami maybe you should think about have some bottom feeders. A schools of cory cat for example. This I why I suggest you pick one fish that you really want, that way you can pick your other fish around that. Right now I'm just not sure what your top pick is.
Don't worry though you still have lots of options.
Don't worry though you still have lots of options.