Quality sleeping bag like Integral Designs rated for slightly below the temp. range you expect. In additon, use a piece of polar fleece inside the bag should you need it and don't forget a backpacking style air mattress . That's if for some reason you're packing in. If your camp is gonna be near your vehicle, the same bag and pad as noted above with a surplus Army wool blanket. Both setups work - believe me.
I'd never trust some sort of external heater in a tent.
Bear in Fairbanks

Last edited by Bear_in_Fairbanks; 06/26/09.

"Unless you're the lead dog, the scenery never changes."
Amazingly, I've lived long enough to see a President who is worse than Carter.
And finally,
Gun control means using two hands.