Thanks everyone for all the advice. No doubt that at least some sort of thermostatically controlled cut off is a must. After reading some complaints that the Finnex and (I forger which other) controller below $100 let the temp vary too much for comfort I was persuaded to look at the RKL Basic. Along with the idea of more accurate temperature control the idea of future flexibility is appealing. So although I don't want to just throw money at this thing the RKL does seem like a much better controller (with .1 deg F accuracy)(with multiple alarm modes...sound, flashing)(and the potential to be a whole lot more).