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Fantastic nano fish selection, and good on you for doing your homework....
I've currently got an Ocellaris and a Six-line wrasse in my 28, and if I do add one more, it will probably be a purple firefish or an orchid dottyback.
I've read that unless its a mated pair, a tank should only have 1 Firefish cuz when they mature, they will fight. Also, I love Catalina gobies, but wanna make sure you're aware they like water that is 60-70*F, and the other fish on that page like 73-78*F, so it'll be difficult to keep everyone happy and alive. Have fun with your tank! I have a 30g FOWLR and 55g reef. LOVE SW!!
+1 about the Catalina. You will need to run a chiller in most instances to keep this fish but you have already been told this in a similiar thread that you started.