Hello, I can only give you my experience with some of these fish.
First off, yesterday I had the opportunity to see a Royal Gramma fully grown, my lord they do get big. Another thing to keep in mind is that these fish have some territorial issues and guard their areas very well.
The family of Dottyback, Psuedochromis, Basslets are all semi-aggressive fish and some more than others. I would not put a Royal Gramma in a 14 gal with a bunch of other fish, maybe just one other that could hold its own, along with some inverts.
Clowns, they are very cute and funny a pair in a 14 gal with maybe a small goby would work well.
Angels, don't put any of the ones you mentioned into a 14 gal. I had a Coral Beauty in my 30 gal and it was not a happy camper, they love to have lots of swimming room and my 30 gal was not big enough, they truly need a much bigger tank in my opinion.
Gobies, I have not had any success or luck with the tiny little Clown Gobies. But a nice and quite hardy one is the Yellow Watchman Goby, had one of these guys and they are fun to watch and brightly colored yellow with faint blue dotts on the gills. The Goby family is huge and I have not had very many of them as they are not all available to me where I live.
The choice of course is yours and we all push the boundaries of aquarium keeping myself included but in the end one tries to find a balance.
Good luck and let us know what you decide to put in your tank.