Dewalt uses a rack and pinion albeit of lower quality than Northfield. I don't think you will regret the VSCT, but am not sure your rationale holds up well. I think you asked some great questions here that someone may launch from someday.
I won't have a condensation problem because it will be heated all the time, but too much humidity could cause wood related problems after projects leave the shop.
I am seriously considering electric, but I have always preferred gas heat and appliances over electric.