If you want a 270, I'd go with the 270 Win. Reasoning for this you don't need a magnum. The 270 Win is capable of anything the WSM will do. You are a new shooter/hunter, you don't need the extra recoil for a little speed.

Ammo for the 270 can be had at Wall Mart, Joe Blows gas and groceries, WSM from the sporting goods store. Bear Lake Petrocan gas station and store sells 270 Win ammo, they don't sell 270 WSM ammo. Don't fall into this "you can't kill a moose unless you use a magnum" hype. I do most of my hunting using my 257 Roberts.

Shot placement is more important then speed. If your rifle is kicking your ass your not going to put that bullet where it's suppose to be to make that kick humane kill.