I'm not a .264 dia fan, but I have an absolutely warm spot in my heart for the 6.5X55. I like it more than the 270win, and if all things where equal, I would prefer it over the 270 (a nicer step down from the 30-06). The things that are going against it, is that it's not always available everywhere, you can't easily/properly make brass from anything else, and the factory loads are enemic (just in case your ever not able to reload for it). On the plus side, it's generally very accurate (all companies seem to do this well, as why buy a new factory rifle that can't shoot as well as the military surplus), and recoil is really no worse than a 243.
Mike