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what Breman said!Circ pump question is a choice you will have to make on your own. My tub has one and I do like it. Not to say my second tub would have to have it. If you love a certain tub are you not going to buy it because it does or doesn't have a circ pump?
I would never own a spa without a circ pump. Why add an ozonator that only runs when the 2-speed pump kicks on? Ozone does not last in the water so you would lose the advantages of ozone without a circ pump! Plus stagnent water is prime breeding ground for bacteria and algae. I also have seen from personal experience in Michigan that the costs of running the spa are a little less with a circ. pump. Just my opinions...good luck!
Did you know that the water in the main lines is not filtered when running that circ pump ? it only gets drawn in to the filters when the main pump is turned on so if you do not run your spa and it does not have a purge cycle than the water in the main plumbing remains stagnant and depending on use this of course can go on for days or weeks.