@GunsOfNavarone - Would you guys believe that the HVAC companies (the large "brand" HVAC companies in my area) wanted ~$5250 for the entire install? That is with a ~$1k Modine. So roughly $4250 for the gas line, hang, electric, and punch a vent thru the wall. And on top of that: I doubt the install would be as tidy. Yeah - it's expensive in my area.
For ref: the heater I got was $1500 plus $200 for the concentric vent box. The heater I got has the upgraded stainless heat exchanger - felt it was worth the extra bucks.