I would suggest that you compromise and get a 280. You will be shooting 7mm bullets out of a 30-06 case. You'll get the best of both worlds. You will get the ballistic coefficients of 7mm bullets and the overall efficency of the '06 size case.
Check reloading manuals and you will see that you must burn considerably more powder in a 7mm magnum to achive much over the 280. I have owned many 30-06 rifles and several 7mm magnums. However, I have never owned a 280...so I speak in practical terms...with no preferential ideas of a 280 as my pet caliber. I'm getting too old to be buying new firearms....but if I did..it would be a 280.
Good luck in your search.

Clint