Dewbuster
The only reason I am able to observe until dawn is becaus of this little device. When observing with others, it is very obvious how much quality sky time I gain. When all other scopes are dewed over and frosting up, mine is going strong.

A dewshield will keep your lens clear on a dry night. In my back yard it will keep the scope clear for a couple hours. The Dewbuster will keep my scope clear all night. The more heat strips you use, the more cables you will have hanging off your scope. Get a roll of velcro to strap them up in a way that will not interfere with your sloohing.