Best unit? I don't know. I only have personal experience with the Pentair units, but it's my impression that they are NOT the best. PoolSean can't recommend his (by forum rules) but I do get the impression that a lot of people prefer the AutoPilot.
Size? Buy big, but make sure you can turn it down. SWCG life is a function of cell on-time. A unit that's 2x larger will be on 1/2 as much . . . but does NOT usually cost 2x as much. The only problems with a much over-sized unit is if you can't turn it low enough. HOWEVER, if you install the power supply with a PLUG-IN connection, you can put a plug in outdoor time clock between the power and the power supply, and that will allow you to turn the SWCG down as much as you like, if you buy a unit that isn't sufficiently adjustable.
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