I'm a believer of buying what a good dealer sells me. My pool store has been with me for 4 years. I go with them as I don't want to do anything but pick up the phone and call "robert" and tell him to fix it, if something goes wrong. In this case, they recc'd the Aqua Rite unit:
http://www.goldlinecontrols.com/Prod...uaRitePro.aspx
I paid pretty much retail too, not going to shop online, hammer him back and forth..just not my style. But got a small discount and labor was fair at 2 hours.
my pool is 15 x 35...