Hey Etunes, don't know if your still looking for a paired shrimp goby, but i know that bluezooaquatics.com sells them in pairs. I've ordered ALOT from them and they ship fast, and all of the animals came alive and perfectly healthy so i give them 5 stars. You should check them out.
Also, that sounds like a great little list you have there. Those fish should do nicely in that tank. Just as a side note, if you see your ocellaris fighting, and i mean like really fighting turn the lights off for a bit. It's like a time out for them and they will stop fighting. Do it enough times and they will stop fighting completely. Mine used to fight to the point where some fins were getting a little shredded. I found out and i started to turn the lights out everytime the fighting picked up. Within two days of turning the lights off when they started fighting, they stopped fighting completely and i never had a problem with them since. You could also try throwing some food in there.. but that only gets there attentions for a little while.