Since you'll be away for a bit, how about getting a copy of Scott W. Michael's Reef Aquarium Fishes pocket guide and reading up on over 500 species and what might work for your situation.
With a tank that small it really is hard to suggest anything that daayda.. Have you ever thought about just having a coral tank? There are guys around when I live who have complete fishless tanks. And I'm not talking about only smaller ones.. There is one guy with a 300 gal that is only coral..
Blennys are also cool fish. Any of the cardinal fish are fine and you could actually have a pair of those. Firefish are also nice but they will jump. A wrasse is nice and colorful, only they are aggressive towards other fish so you'd have to put him in last.