The .270win in my mind is the classic western open range mule deer cartridge.
You may consider the 7mm-08 now that you're talking 270 vs. 308...
There's also the .280 Rem(great round, less popular than the 270/'06) or 7mm Rem.Mag. (more popular) and I wouldn't think of the 7mm rem.mag. as the same class as the 300weatherby, less kick etc... you can also shoot 175gr bullets if you wanted tos low down that bullet for closer shots...etc...locally, and if you ever went out west shoot 160's etc...or whatever you wanted.
lots of options!
270, 280, 7mm-08, 308, 7mm Rem.Mag., 30-06