For that size of tank, you can never go wrong with true percula clownfish, skunk clownfish, or ocellaris clownfish. There are different color variations of each that are really nice as well. If you are looking at other types of clownfish, they can get bigger and more aggressive, so you would be less likely to get other smaller/timid fish. As for damsels, they can be great as starter fish, but you will find that they become very aggressive.
For your size of tank, and age, I would stay well clear of mandarins. They recommend much larger mature systems so they can munch on live foods, even if they are taking some frozen foods.
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