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larry,These spas are on my shortlist:D1 , Sundance, Hot Springs, Caldera, Artesian is also a good brand, For a best overall package from manufacturer these are all top brands, they are pretty equal , as for a package, ( steps ,lifter, chemicals, etc... is usually up to the dealer they usually are not made by spa manufacturers. Best shell shells are made by Aristech and Lucite, with the exception on the Ultralife on the D1 and the Endurol on Hot Springs, And all these brands use the 2 acrylics brands i mentioned. One thing i would not get to involved with on the shells is the thickness of the shells they are all over the place, some use fiberglass to back it and hav a bonding agent in between to keep from delaminating, some use a plastic based backing. you will find the warranties are almost equal,on the acrylics, the Ultralife is longer, ask your dealer on the ultralife to explain the diffences, Best isolation most of these will have a compartment with the low amp 24 hour circ pumps, some of these have snubbers on the base of the pump to reduce vibration noise, again toss up there. Ozone all pretty close Check out the Ultrapure water management system on the D1, its not just your typical plug in and short tube to the made vessel of water,,, they off gs in the pump compartment, still injects ozone in the tub while your using it and is approved to do that. I am not a fan personally of bromine tabs, i like the chlorine, less maitenance issues on the spa... in my own tub i am on a well , and i use chlorine with the ultrapure sysytem and Vision mineral cartridge, i can hardly smell it....remember while looking buy from a dealer that you trust, and are comfortable with the company, You might check out Spasearch.org , check to see if the brands has earned the independent audit for a certified manufacturer, as well as a certified spa dealer...good luck