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Be careful comparing Soverign prices. There is a 110V and a 220V version. The price difference between the two is about $1000 (220V is more). There were several differences between them but I don't remember what they were. I'll try to see if I have the prices that I was quoted in NW NJ when I get home tonight.We ended up buying the HS Envoy for 7800 with ozone, steps, and lifter.
For many years Hotsprings offered the sovereign in a convertible unit but now you can buy the soverign in a deeper higher perfomance model that only comes in the 220v only this model probably will become new name model in years to come.