I think you need to just realize that maybe there isn't just ONE right spa for you. You could get a Arctic, artesian, Caldera, D1, Hot Spring, Jacuzzi, Marquis, Sundance etc. and proably be perfectly happy with most any of those. Certainly there are some you might not be happy with but I think you're waiting for the moment when you see the right spa and the heavens open. Go wet test the more reputable brands in your area and go with your gut as to which one you like best for wahtever reason (feels best, best dealer, shinyest jets, cutest saleslady, free duckies, etc.).
I have a history of buyer's remorse. A spa, a place to relax, is the one purchase that I will not allow myself to regret!!!