I spoke with a family friend that has a deep water tank and these are the basic things he related.
Most of the SPS corals from deep water are varying shades of dark brown and may floresce (sp?) with some greens, he generally feels that they are not the most atractive corals. He also said they require strong, turbulent current flow.
They have just as great calcium and alk demands as the corals higher in the water, and tend to require very stable SG and PH. They, as are many of the other deep water creatures, somewhat sensitive to temp. fluctuation and don't tolerate higher temps well.
His general recomendation was not to try any of the deep water life in a tank as small as yours. Too difficult to maintain stability of water and temp, and with the issue that most of the corals from the depths are filter feeders, too difficult to keep the water cleaner with the amount of filter feeder food that you would need to use.
For your tank size and lighting, he really suggest that you stay with softies. He also said to say that this is just his opinion and that he doesn't consider himself an expert. He does have a 300G deep water tank and I've been trying to get some pictures to post, but he, like several of my other friends, has yet to come into the computer age...LOL