I am a huge fan of the 6-line Wrasse. Beautiful little guy and interesting to watch. I would also go for a pair of clowns, false percs are a favorite but maybe you would like black false percs or something of that nature?
As much as people complain about damsels I have 3 of them in my 40 breeder. They get picked on by the clowns (Even the baby male) and the 6-line. If you did get a damsel, I would make it the last of the fish to get to tone down his behavior as boss of the reef.
A Yellow Watchman Goby is interesting... if you plan on not doing SPS
you could also try a Clown Goby. As for angels I would try a Coral beauty (much safer than the prettier flame angel).
Anyway there are some thoughts, enjoy!