Thought I'd jump in here as I have heard the magic words, "cookstove that can be used as a primary heating stove"....
We live in the Yaak Valley of NW Montana, most of us have one stove that does both their heating and cooking all winter long. They don't run a second stove unless it is really cold, minus 0. Folks are busy and we don't have time to cut and split extra wood, or mess with stoves that need tending more than twice a day. Cookstove's that need to have the wood split the size of sticks and 16" long don't cut it up here. Some of the "Ornamental cookers" don't cut the make the grade either.
We look for cookstove's that are heavy welded steel construction, employ Thermodynamics to create convection heating, without fans, will burn wood 18-20" unsplit, heat and bake well, heat our domestic hot water systems, require little maintenance to keep the oven operational.
There are a few choices out there, the Ironheart is a great choice as it meets the above criteria with flying colors.
Depending on what you want to do with your stove, cook on it, or in it, will be a deciding factor. If you just want a nice little stove that wont break the bank, will work well and look great, the Napoleon 1400 C is a pretty straight forward stove, simple welded steel construction, famous 1400 bulletproof firebox, great looks of a cast iron stove, non cat, flip up lid to cook on and it will heat your space just fine. For what your asking, that would be my best suggestion for the layout and size of what your building. We have sold quite a few and everyone has been really happy with the stove, the opening top lid hides the mess you get if you cook very often and the little splatters you get on the cook-top that are hard to avoid. If you find you have to cook on it often, you will probably wish you had gotten a stove with an oven.
We have a Kitchen Queen 380 in the main house, 1200 sq ft lots of glass, open floor plan 20' ceilings, I regularly get 14 hr burns with no problems. Our daughter has the KQ 480, 2200 sq ft, an 18 hr burn is not uncommon. I'm sure anyone else that has burned a Queen will attest, amazing burn times, even if your not blessed with hardwoods.
It is all in the gaskets and the way the stove is built and engineered, very tight cookstove, Cant see the fire yet, but were working on that.
We also burn the Ironheart in the 600 sq ft cabin I built for our younger daughter.
It does a great job and I have folks in Alaska heating 1500 sq ft with the Ironheart.
I cut the wood, the Ironheart will burn less wood than just about any cookstove I know of, it also burns cleaner, the firebox is not large by Montana standards, but acceptable as it only needs tending twice a day. The Ironheart is a good looker as well as a good cooker.....Seeing the fire makes it unique, but it also makes it hard to cook in front of as it will light your nickers up. The sliding screen helps, but I find if I stand in front of it very long, I move to one side or the other. Size wise, it is almost the same size as a KQ 380, which is about perfect for the floor plan shown, in a cookstove with an oven.
Without the oven, check out the 1400C by Napoleon.
Hope this is helpful, you are getting lots of various opinions, simple is usually best.