Since you are from the states, I would say you are probably in the best country for purchasing rare and beautiful corals. That's because the only the states and EU (not to forget Japan) got the reefing population as well as the purchasing power for exporters in Asian, Carib, Indian, Redsea, Fuji etc to make more margins $$$$ then other smaller countries. Therefore, good stuffs mostly were usually exported there.
For SPS, it is subjective as to which is nice and rare. Some people might find, for example, leng sy cap (a kind of monti) to be beautiful but others do not. Red staghorns may be popular once but look at it now. Tri-color acros used to be hot too. Not to mention once coral cultivators got hold of rare stuffs, they "mass produce" it and dilute the rarity of it. There were superman montis, rainbow montis also.
While coral beauty and rarity is one factor for the periodical crazes, there are also corals that require extreme care and good parameters for growth, let alone its survival. Thus these will relate to how well the water parameters were maintained and further indicate expensive equipments and ultimately inflated egos and rivalries. These corals will then be catagorized as "rare" as few reefers can keep them in good health.
Thus in order to answer your question, you must know your objectives in keeping a reef tank, especially in keeping sps. How well can your tank water parameters be maintained? What are your lightings? What fauna is/will be present?
Lastly, be sure to buy aquacultured corals. Be a responsible reefer.
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