I'm a 1st time buyer in north east and have narrowed to three tubs offered to me for all about the same price. We can't decide and are comfortable with each of the dealers. Struggling between American Whirlpool 271 (should I be concerned about insulation?) Saratoga C40 without full foam, and Artesian South Seas 748 with full foam. I'm concerned about cost to run (we will use year round), jet power/variety. All come with cover etc., Thanks for your input and suggestions.