Been down to -17*F, here in North Central Wisconsin, already. My Drolet Baltic has kept my 1920's Craftsman (1500 sq. ft. Of old, drafty, single pane frigidness, before I got this stove!) at 70* or above, through it all. Didn't even have to push the stove, until it hit -15. Slightly smaller than the HT 2000, at 3.1 cubic feet, and only rated at 2200 sq. ft., as a posed to 2400. That aside, I've got nothing but respect for the Drolet brand, when it comes to no-gimmick, basic stoves. To be able to make such a well thought out stove, with this level of fit and finish, at the price point they do, is impressive.
That said, you are at the upper limit of the stoves performance, unless you have a really well insulated and sealed home. Good stove placement, etc., will be probably be even more important than usual, in your case. There are many on here with far more knowledge, than I have, in those areas. If you ask, they can offer good advice. Their advice is a big part of why I'm so happy with my stove, here in my first year.
Best of luck, in your choice.
P.S. - That NC-30 sounds like a great stove, and has a substantial following, here. That would suggest that it's also a darned fine basic unit. People on this board whose opinions I respect swear by it. I wouldn't hesitate to pick that stove, either, if the details worked in my favor.