If you are worried about wood consumption the e models are the way to go. If you want a basic furnace then the others do fine. I too would be interested in what other brands and prices you have found. As a dealer who can normally under price the competition in my area I find such things fascinating. For example Heat Master doesn't have a G model that lists at $9400.00 Not sure what model you looked at but either the dealer is over pricing the G200 or under pricing the G400.