Late model or new cabbed 4x4 diesel tractor with FEL, SSQA and at least 2 rear remotes. I would go *at least* 30 hp, since you say "with some elevation". How much elevation are we talking about? You may want something with a turbo so you don't suffer a big hp hit from the thin air.
You may be ok with a front plow, if you have plenty of room to stack snow. The down side of *only* a plow, is if you DO run out of room for snow piles, you're kind of hosed. A rear snow blower will let you throw snow over the top and past the existing snow piles.
A block heater is obvious. But an oil pan heater and a hydraulic sump heater are the cat's backside when it's *our version* of cold. My tractor sits in an unheated shed, and spent it's first 3 years parked outside. Like you, it gets cold here (you may be colder, depending on how far up state you are) but it regularly gets -30 to -40F here. Those 3 heaters, block, pan, and hydro sump, will keep you tractoring along all winter. I have mine on a timer that comes on at about 4am, and turns off at about 10am. You'll also want to run synthetic oil.
If you're plowing/blowing snow on hills, or steep driveways, you will want rear chains for sure, possibly front chains if you're getting pushed sideways by the plow.
Just another day...
At least at our new house, all my "stuff" can sit in an enclosed (yet unheated) building.
