Moto if you go to the sponsor's page you can find many of people's favorite stores. As far as perks, from what I know Jody from Totally Exotic Corals is offering free shipping. I don't know of anyone in this forum that shops at Caye's.
My favorites in no particular order:
Tim at Westside for corals
Seahorse for fish (also makes stands, canopies) , good prices on fish
Isaac at TCM (have to call because his store is in an unmarked warehouse)
Davy Jones (small place but makes nice sumps, stands) also good prices on fish
I have heard good things about Rose City just don't seem to have the time to visit everyone...
If you're in the Salem area you gotta check out the Premium Aquarium. Shop is run out of a garage. Very nice set up.
On line for rare corals: Totally Exotic Corals