I am ready to buy an insert and have the option of buying one of these 2 stoves as a really good deal off of a floor model. Both will fit my fireplace no problem. The Napolean is 2.25 cubic feet firebox and the buck is 2.6 cubic feet. Both seem very simliar and are epa certified. We are leaning towards the buck because of the bigger firebox should allow for longer burn times. Thoughts on either of these models?