@RCP: Since many rifle loonies (and I use the term kindly) hang out here, you will probably get a biased consensus for the 6.5-'06. I land on that same spot also. Practically, the .270 win makes more sense, but I've always been intrigued by the 6.5-'06. Matter of fact, I thought it should have been commercialized before the .25-'06, but given the current fad of short fat cartridges, its time for commercialization has likely passed.
I always thought the .338-'06 should have been commercialized instead of the 35 whelen, too. (or does the .338 A-square count? not sure.)