I'm going to go against the grain and recommend you buy a smaller stove. Something in the 35 to 40k btu range. Why? You've got a small footprint and average ceilings. A stove is far happier running at its highest most efficient settings, than it is running at its lowest least efficient settings.
Lastly, I did a survey here last year just after the polar vortex and about 100 people responded, and what did I find? That only 10% of the people here, on the coldest days, needed a stove over 40k btus. A 40k btu stove on its highest setting can burn 5 lbs an hour, which is 120 lbs in a day, which is a 3 bag a day habit. Yep. How many people on here stated that they needed to burn 3 or more bags a day on the coldest days last year? About 10%, and that's for homes of all sizes, and all locales. Seriously, just about everyone here is oversizing their stoves.
More lastly, you mentioned supplementing your heat, and you mentioned not making it too hot. All the more reason to go with a smaller stove.