My vote goes to the the 30-06! It can be loaded any where from 110gr all the way up to 220gr. My favorite load is the 125gr or 150gr in Nosler balistic tip or Hornady SST for whitetail. When I went to buy my rifle there was the 30-06 and 7mm mag both in Winchester. My uncle all ways recomended the 30-06. I really liked the 7mm mag, but at $18-$22 box of shooters is just to much. I have never regeted getting the 30-06. At Wal-Mart a box of shooters is only $10.97, can't beat that. Less money to practice means more practice and I have never felt "under gunned". Even though it has not happened yet it is only a matter of time that my cousin and his 7mm mag w/ 4 shots and my 5 shots from my 30-06 will make all the differance in the world.
I must also admit that that 300 WSM is very tempting, but for same reason of cost of ammo and besides, I really don't need one any way.