I'd say 30.06,270 or the 280!
The 30.06 is the most versatile.
And if you don't reload I'd stay away from the 280,there are more factory ammo choices for the 30.06 and the 270.
If your looking for a mag. I'd go with the 300win. I've always liked the ballistics of the 300.
As for brand the 700 BDL is a great rifle,and some may disagree but I'm rather partial to the Win. model 70's I have several, and all of them will shoot less then an inch at 100 yards!