I have jumped onto the 7mm mag band wagon in the last year as well. looking for a great mid to long range hunting rifle, with enough to knock down at those ranges.
Though I have many guns, I wanted a light weight gun that I can shoot alot, and shoot well. The 7 mag does that well.
I normally shoot 5-6000 rounds a year not including my handguns, so I wear out barrels, most hunters will never shoot that many rounds in there liftime.
And that is what is needed when you become proficient with your rifles.
I choose a Christensen Arms Ridgeline FFT for my mountain rifle in 7 mag, components are not to bad to get, and it doesn't burn out a barrel as fast a stw or a 28 nosler. The PRC was too new and no brass available when I bought my last one. I figure that I will more than likely get a new barrel for this paticular one next year at some point, because by then it will need one. So every 3 or so years throwing on a carbon wrapped tube for $1200-$1800 is not to bad, the powder,primers and berger bullets cost a pile more than that.
I figure the 7 mag is one of more usable calibers out there, and shooting 168gr VLD's at the range the rifle doesn't kick near as bad as a 300mag with 180 vld's so thats why I went this route.
Thought about getting a 7SAUM but components were the issue again with it, couldn't find any at the time.
I don't think you can go wrong with the 7mag, there are other choices, but if I was going to only own and hunt with one gun in Canada you could do alot worse than a 7mag.