I don't think there would be anything wrong with going with the smaller model. Again I'm happy with my stove but do worry sometimes. I think if treated appropriately and not abused the DW would be a fine stove just for you and your 6 inch liner not the XL model.
I think blaze king line of stoves is out of your budget and honestly may have been out of mine If i had sat down and crunched the numbers. There are a good deal of good stove companies out there. And sometimes the amount of burn time you get is more dependent on your wood quality, type, and moisture content as well as floor plan and layout and square footage than on the stove itself.
I need to heat 2500sq ft. I want a quality brand stove that will heat that and the fire lasting at least 10hrs. I cant believe all the negative talk about VC/DW. Im glad I joined this forum. Please post some specific stoves for my requirements and budget if you can. All this help is greatly appreciated and quite amazing