280.
But I'm prejudiced.
I was just given a rifle in 280 Remington built on a Brno M98 action with a new barrel, synthetic stock, Sako trigger and slick hinged floorplate. Must have cost the original owner a pretty penny to build, but my buddy bought it and passed it on when he was feeling generous. Lovely.
But if your 30-06 barrel is still good, don't mess with it. I have a BSA sported US M17 in 30-06 and except for being a bit heavy, it is a good serviceable hunting rifle as it.