I'm looking to buy a new thermostat for a bp rack I'm building. Right now I have my ball pythons on hydrofarm thermostats, but I don't really like the on/off heating function. I want to stay in the $100-120 range. The ones I have in mined are the Herpstat Intro, Herpstat 1 Basic, Ve-200, Ranco thermostat. Which one is best for flex watt heat tape on a rack?