I agree with most of the recommendations so far and I'd like to add Hydnophora and Anthelia to the list. With regards to Hydnophora, I traded in a small colony to our LFS several months ago. It is now the oldest living coral in their system. At some point everything else they have had since has either sold or died. In many cases the latter has happened.
Some people may complain that many of these softies are too invasive and will eventually cause problems for the new aquarium owner. I have met very few people starting out that this has happened to. In most cases even green star polyps don't make it in the new persons tank. Their system is either so horrible that they cant survive or they have a major tank crash within the first two years and loose everything.
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