How well are you going to insulate and air-seal it? Getting new windows?
Woodstock's "area heated" ratings are quite conservative. With good weatherization, I'd guess the Fireview should handle it. The reason I switched from it to the Keystone is that I wanted the big window, and I was spoiled on the grated ash system from when I burned the Dutchwest. It would be interesting to see how well the Keystone would do in there, but it might be iffy. Safe bet would be the PH, and it has it all; Big window, grated floor and ash pan, and that delicious radiant heat. Sitting in the stove room, you'll be able to feel it 20' away. The radiation should balance the heat better between upstairs and down.
It sounds like you are thinking of putting the stove somewhere else but I would use the fireplace and rear-vent a Woodstock in there. That's why I asked about lintel height, but it looks like enough. It'll be a clean look, with no pipe visible. You'll still get a nice view of the fire, and you'll get heat in the bargain...plus it will look fabulous and well-scaled in that hearth setting.
That shouldn't be a problem with the PH in that space, since you can turn it down to a cat-only burn and take the secondary out of the equation (hybrid stove in case the OP isn't familiar.) They do say "heats 2200 ft.
easily," though..I'd ask them for sure.
I knew I would go down a notch in heat output going from the Fireview to the Keystone, but figured I could make up for that with better weatherization. It's still a little harder to keep up in windy, single-digit weather, and it might get down into the upper 60s in here on occasion, but I still have more air-sealing to do.
Most companies "area heated" ratings as a rule aren't as conservative as Woodstock's. We have a cabin here, only 1000 sq.ft. and no loft. Attic insulation helped but there's no wall insulation, and wind gets between the logs and the wallboard, pulling heat from the room. When I get the air leaks around the corner logs sealed, I expect to do better in cold, windy conditions. Sounds like his place may be sealed with exterior stone..
Oh yeah, we'll need some pics of the outside of this place as well.