Thanks for the input...to clarify, I will have the plastic enclosure sitting on a wooden table and thought it might not be a good idea for the heat tape to be in contact with the wood, I don't think it would get too hot but after being married to a firefighter and hearing horror stories for 10 years I suppose I'm a bit paranoid lol. I was just going to affix rubber spacers to the bottom of the tank to set it up off the table a bit.
Again thanks for your input, I am happy to spend the extra money for a proportional thermostat if it will be better for the snake.