What fish to get next?

[Moogled]

Aren't Royal Grammas jumpers as well?

Try several Anthias. I'm not sure if your tank will permit the additional bioload that comes with these fish, but they will bring your tank to life for sure.

IMO there's really no "perfect" fish for an aquarium. If you're looking for a strange fish, a Tassel Filefish would be an awesome choice too. Most of them are fairly docile, but some of the few may nip at corals.