Not interested in the smaller cal. at this time, pretty sold on the 300 win mag although I will consider the WSM, especially with that comment about reloading being easier.
I don't know if you've ever shot a .300 Mag before; if not, I do suggest shooting one before you purchase.
My traditional favorite rifle is the Ruger M77 but I would look hard at a Savage if buying one now. They have a reputation for being very accurate.