IMHO - This is my experience with these LI stores.
Country Critters - Patchogue - Widest Selection, Largest display, Knowledgable, Most Expensive. Use a quarrentine tank.
Fish Town USA - Norther Blvd. Flushing Queens - I don't use them for their advise, but I've had some good deals there. e.g. Large Healthy Purple Tang $40
Mutts & Butts - Merrick rd. Merrick - LFS Near my house - Expensive, knowlegable people, but they will sell you stuff you don't need.
Use a quarrentine tank.