I've been looking at this from the OPs perspective, as I always try to do. I don't why on earth anyone could possibly think a SCUT would be appropriate. My uses are smaller than his, but I went through the same logic. I wanted something that could plow snow, mow, and be general utility on my 25 acres. Now, I could 80% of the time get away with 25HP. But I determined that if I needed to pull a car, or plow big snow, run more efficient implements etc, 35HP was better. I also judged that I was making a once in a lifetime investment (20K on a tractor is one time for me), and it was worth spending a few extra K, spread over a few years, to make sure that I got a machine that would cover 95% of my possible needs. Now, if we get 10ft of snow, or a semi-truck gets stuck, I can't handle that. But that possibility is very far-fetched. My investment has ensured that I can handle almost every reasonable scenario that occurs around me. Some don't occur very often, but when they occur, I can handle them.
The same applies to the OP. He's not going to be plowing the road regularly unless he goes 75HP+. No need for that. But he doesn't want to spend 20+ thousand only to know that if it snows decently he has to rely on his neighbor to plow him out. Also, at 40HP, if he really needs the road clear, he can do it, might take a while, but can be done. There is nothing he mentioned that requires a smaller tractor, so I'm not sure why Axle is pushing his usual argument that all properties can be maintained with SCUTs.
Brand wise, LS is a solid brand. I really liked them, but the dealer by me is infamously bad, and at the point I was looking, Kioti was the better tractor. The XR series is very impressive IMO. You are correct in that Kioti offers a factory cab only at the NX4510 and up. The NX is also a good tractor, worth a look. I don't think 45HP is overkill at all in your situation, I would think that'd be about right actually. Not sure if it's turbocharged, that is definitely a plus at your elevation, very likely a deal-maker for the LS, as often those aren't available until 50HP or above. I don't know what the LS is priced at, but the NX4510HC with loader tends to run about 29K, IIRC.