Welcome to the forum,
I'm not going to tell you what stove to buy or the reasons why. There are planty of people and opinions enough here for that. Do your homework and you'll find what's right for you and your situation.
I would like to restate what VigII said, that location of the stove and most importently (because you have more options than where the stove is placed) the location of the floor registers. This will make sure you get the best circulation for your home. As Vig said, you need to find the cold spots/areas and put your registers close so that the cold air can sink down and start the circulatory flow. Many people make the mistake of having a register right above the stove and while you will get heat moving through it, the cold air pushing against it slows the flow. Picture in your mind a siphon effect where you start the flow by dropping that cold air.
You have everything you need here (information wise) to choose the stove that's right for you. Take your time and get it right the first time. 2000sq feet in an open plan could be heated by a stove the size of MarkII assuming your house is well insulated and tight which of course being new it ought to be. There are several people who use that stove that can advise you and there are many other stoves, bigger/smaller, better, not as good, Antique (My preferance although I said I was not going to try and sway you
), modern, hand fed, stokers, boilers, furnaces, etc... Check them all out, ask the questions, and you'll make the right choice.
PS: Also like Fred mentioned, a 12hr schedule is more realistic for tending your stove. Some can and will certainly go longer but in the dead of winter running at optimal temps, 12hrs (7am/7pm for me) works well and you never have to woory about losing the fire or have a large drop in temp while the stove recovers.