Morning gents,
My vote would be for the 6.5-06AI, I had one built 2 years ago as a christmas present for my father with a 26" tube 1-8" twist. This thing LOVES 140grn bullets, fire forming 25-06 brass is really easy once you get the hang of it & achieving or in some cases exceeding .264 win mag velicities is quite doable. As a hunting only rifle the barrel will last for years to come; I do have a buddy who shoots a 6.5 WSM and at this time is getting more velocity but we aren't talking much +/- 100fps.
Just my 2 cents, hope it helps-