I am really struggling to make a decision on a natural gas unit heater for my 40x40 with 12 ft. ceilings. The garage has r19 (2x6) in the walls and I will be blowing in fiberglass in the attic. I am pretty much settled that a 75btu will work, but can't seem to pull the trigger on which brand. Menards has the Beacon Morris on sale very similiar to what the Mr. Heater is pricewise and I can get a corporate discount at Grainger to get me within a few bucks for the Dayton. Any input? Thanks.