a potters angel is also a nice choice imo as opposed to the flame.
I like the look of the potters, but people on here will tell you that they can't keep them alive for over a year. The flame angel and coral beauty are the typical angels that everyone talks about for that size tank. Another option would be a blackback butterflyfish, they are pretty cool looking.
I have a sfe right now, it's just a baby and I have him housed w/2 ocellaris clowns and there were 2 firefish but one died about 3 days ago. I'm not exactly sure why he died, but I do suspect the eel. The eel doesn't pay attention to the clowns because they move around a lot, but he always watches the firefish when he's hungry because they tend to hover. Hope that helps, I would say smaller fish are fine, but I'd go for some more active fish.