I like the tought of having a lightwieght 'ish" 7mm, but cant think of why you would go for a heavy"ish 300 win. I like both, but I think that they are too close in performance.
I would drop your coin on the 7mm (probably a SAUM), leave it unbraked and have something that you can shoot very well and still hunt with. Then get a heavy .30 cal (or .338
) and have the brake on it. It just opens more doors for you. trust me, the first time you find a good place to shoot over the 1k mark, you'll want to do it again and again.