If I was to chose between the 300 Winchester mag and the 300 WSM, I would pick the 300WSM. It is a better designed case and with the short powder column and longer neck, it "may" shoot better than the belted 300 mag case. That is not a given and the 300 Winchester has proven very accurate over the years, and there are some fantastic loads for it. The WSM will result in a slightly shorter and handier rifle, and maybe weighing slightly less, but not much. I'm just a real fan of the 300 WSM. My son has one in a Winchester Extreme Weather rifle and I really like that thing. As far as the muzzle brakes, I don't like them and I don't feel they are necessary on a 300 magnum or smaller caliber. Those suckers are flat out loud and they add length to your rifle. I'm not trying to talk you out of a 7mm, I'm just thinking out loud on it because they are so close together. The 7mm Remington or the .280 Ackley or regular 280 Remington would be very hard to beat for an all-around rifle for animals from coyotes to moose, or even a grizzly bear. I'm a huge .280 Remington fan and with my new .280 AI, I'm one of those too. It is really hard to go wrong with a 30-06 though and I think that is such a great round. Man tough choices.
Savage. I've never owned one, but have shot one and it shot very well. My reading on them is that right out of the box, Savages tend to shoot very well. I've never heard any complaints about quality or how well they are put together either. I think for the buck they are very good rifles. For some reason I've never warmed up to them. I have a buddy I work with and we used to shoot his Savage' (French rifle - pronounced Savaaage) against our Remington 700's in competitions and his rifle shot equally as well as ours did.
I think if you decide to go the Montana Rifle Company route that you will be very happy. Cabella's here locally has a couple in stock, do you have a Cabella's near you where you could go look at one??