redneck,
i use a gt 55/75 out of a 56# longbow and out of a 60# longbow, i have a buddy, huntnmuleys, he also has a recurve that is 65# at 26.5" and uses 55/75.
the point is that if you choose a carbon shaft you could add wt tubes as i did for my up coming moose hunt in sept. or you could take them out for a little more speed on the whitetail hunts.
it is all just a little time tuning to get what you need. remember the length of you shaft makes a huge differance on the stiffness, and also how heavy of a broadhead you use.