I agree with Suzy about Green Chromis. They have to be the nicest, most well behaved fish there is and don't eat all the bugs you want to have in the tank to handle the consumption of microalgae and detritus. Sorry but they are damsels!
Anemonefish are the old reliables and look good but they are damselfish too!
A non-damsel that is good to have is a tang and a single fish is not usually too rough on non-tangs. Rainfordi Gobies are nice, cute and algae eaters.
Best for the biotope not to add carnivores for a few months.
Actually, most people don't think of this, but small corals can be better organisms to start with than fish, so long as you aren't planning to add a load of live rock immediately. Mushrooms and leather corals are hardy and the advantage is that they are not as messy as fish. They usually come on a rock that contains its own biotope, which spreads quickly. Interestingly, the coral and its rock gets shipped in water so the rock loses little life, whereas typical live rock is left out of water for 2 - 4 long legs of the shipping process. This leads to lots of death which requires more time for our aquarium to cycle!
Best results come when new aragonite sand is traded for live sand from as many friends/WMAS members tanks as possible AND use some old water from someones water change. Ask to buy or trade with a friend for some pieces of live rock that you keep submerged in transit. These actions will get your tank up and running well within a week. Careful though, because you may need Reef Janitors right away!
Mark's 2 cents "thinking outside the box"