Depending on your price range and the weight you intend to carry, you might look at the Osprey Atmos and Exos series packs. I'm not trying to start an argument about whether they are internal or external frame packs, but having tried them I found they blended some of the features of both: the ride was more like an external, in that it stands away from your back (you are in contact with a mesh trampoline); the loading and pack bag design is definitely internal.

These may very well not be what you're looking for, but at least give them a quick look. They're nice packs.