I read New Marine Aquarium throughly and it was extremely helpful for someone just beginning. I have skimmed the Conscientious Marine Aquarist and it seemed to be good for a more advanced hobbiest but I havent had time to read the whole thing through yet.
I hope to set up a 10 gallon nano saltwater when I get a good paying job and can afford it. I am going to do the harder nano tank because it is cheaper, but I do know it will be harder to keep stable. Definately read the New Marine
aquarium book if you are starting out.