I like our marina/ship yard in Muskegon, Michigan, Torresen Marine. They let you work in the yard, provide expert service. They have been especially helpful on the re-paint AWL GRIP job. We did most of the prep work & masking and their artist made it look like new for about 1/5 of the cost we'd expected.
West is expensive but very helpful and most stores have someone pretty competent and knowledgeable.
I've found the on-phone contacts for technical assistance for both Interlux and Petit to be exceptionally helpful and that they had no trouble recommending the other guy's bottom paint over their bottom sealer and how to make the bond layer work. Also pointed out that the on-can instructions for this were no good.
LED lights. Marine Beam, Bibi, Signalmate - all three first class. I've spent a lot of time with all of these guys on line, on phone and at shows. I have some of each so far and will have more.