I second a wrasse. I went with a Melanarus wrasse when I was looking for a fish for my tank that was active and he definitely is. He's always out in the open and has been from the beginning.
I believe this wrasse is recommended for 50g and up but I'd say just about any wrasse would be a nice active addition to your tank.
Angels are lovely fish but if you have corals or plan to, angels would probably not be the best as they tend to nip.