Welcome to our forum.
You guys said Caldera, D1, Hot Springs, Jacuzzi, and Sundance were preferred quality spas. ALL of them, as well as Marquis, have local dealers here. In fact, this may be the hot tub center of the world, I don't know. Certainly they were big out here when I first skied Colorado in the 70's, and still are part of the culture.
....What I need is, help from knowledgeable hot tub experts, about THE INTERNAL DESIGN OF THE PLUMBING. I said my Cal spa developed many leaks all at once because of a design flaw - plumbing held together by only organic glue. Now I want to find a spa that is DESIGNED TO LAST. Things like screw clamps, access to repair hose fittings from inside the tub by pulling the jet nozzles into the tub which is then sealed against leakage by O-rings. Details like that. For me to fix my Cal spa....