I'd go with www.autotopoff.com they have great prices and they sell excellent quality float switches. I've used them on all my tanks and haven't had a problem yet.
I really like the Reef Fanatic dual level controller. It has a couple of nice features. Dual switches to prevent a failure. The switch is very sensitive so that a very small drop in level kicks it in. This is important when you are using limewater topoff. It also has a hysteresis window so that the topoff pump doesn't constantly turn on and off.
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