Well, we'd like a good one. Willing to spend a little more and not have to replace it down the road. I just read that if you have a high ceiling it ups the square feet capability a stove would need by quite a bit. Something like 2000 to 4000 if the ceiling is over 10 feet. So, having read that, I want a large box. I'll have a look at the 4.3, thank you!A 2.5 CF stove isn't a 2.5 CF stove, either.
You can get a terrible stove like a U.S. Stove fixed burn rate unit, and opening the window will be how you control the temperature of your living room... or you can get a better stove that can control its burn rate and go 8-24 hours on that same wood that went through the bad stove in 4 hours.
I wouldn't hesitate to put a 4.3cf King into a small house if it was for my own use. Firebox size is just the size of the gas tank if the stove is very controllable and the operator knows how to work it.