We've had some chat on this topic recently and I recall that the general opinion was that the Mr. Heater Model MH15C was the preferred style for Colorado. Several writers said that it handles the high altitude better than the Buddy types. The best price I've found so far is at Fleet Farm for less than $40 plus freight. I've been using mine for 10 years or more. The main caveat is that it's not rated for a closed environment such as a popup. Carbon monoxide probably. They do put out some nice radiant heat and will boil a quart of water in about three minutes or so in the cooker posture.
