See what you like. With that lighting and calcium you should have no problems. I had a crocea and a derasa, I actually liked the derasa more, but they are all awesome. Placement in the tank will have more effect that anything else. Start them lower in the tank and move them up slowly to prevent them from getting light shock (they can handle lower light than they were in before better than a sudden increase in lighting).
You need to check your KH too, you don't want high calcium with a low KH, they should correlate.
I highly suggest Giant Clams in the Sea and the Aquarium by James Fatherree to anyone who has or is thinking about getting any Tridacnid clams.