We have the Optima, use Baqua, no ozone.
I'm sure this isn't the least expensive route, but really, the cost of chemicals isn't that bad, and our water quality is great. So for now, I'll stick with what I've got.
For us, the amount of sanitizer we have to add is only a couple ounces per month, going by the Baqua test strips. So a bottle of sanitizer lasts several months.
I can always add ozone anytime, if the mood strikes.
Brewman