The part one had too much slanging and usless bickering on it for my liking, especially over something that has very little importance. I don't really care if I bought a spa with or without a circ pump, both systems work equally well (tho if I bought one without it would be a must to have a 2 speed pump for midnight noise issues - i currently have a spa without a circ pump - just a 2 speed, right outside my bedroom I can't hear it start at all) and it would not be a feature either way that would sway me, I think other features have much greater importance.
I found this page which is quite interesting, down the bottom the guy figures the costs against each other.
http://www.angelfire.com/mi2/hottubs/chemicals.html