There are tons of awesome SW fish. How big si your tank? I think the Hawkfish are pretty sick, they roam the rocks looking for pray, but they are very peacful with most all fo your other fish. I also really like Ocellaris clownfish. They are REALLY amimated and they interact well with me when i watch them, play with them, feed them, etc.
You have so many options, and almost all fish have their woen unique/cool personality...