How often, really, do you need to have access to your sleeping bag during the day? For me the answer is, Once -- when I get to camp and set up for the night. At that point, having it at the very bottom of my pack is hardly a nuisance. I've never understood the popularity of the "sleeping bag compartment" for this reason.

The REI 65 pack is nice, and of course they have the bulletproof guarantee. Try it on, though, since pack fit is so individual.

While you are making a list, let me add my favorite pack, the Six Moons Designs Starlite. As long as your total load stays under 30 pounds or so, this is a terrific pack. Make sure you get and use the aluminum stays.