For the what to carry it with, rather than the what to carry, ignoring the other factors....

I still like the ALICE packs (with HSGI's ALI-Pad if I need to use the USGI frame) and anyone other than the Army's shoulder straps. CFP-90 sucks a bunch, but that's just becuase I've never seen one with the inner spars that were adjustable, to thick and stiff. If you could find replacement ones that could actually be fitted to the user, they'd be great. Mountainsmith, Kifaru (both thier hunting and thier military lines), Gregory is good. Even LL Beans bags are good- my brother swears by his, has since he was in Scouts. Dana and Ospery both seem to be highly thought of, and amoung hunting guides, Cabela and Gander Mountain's lines seem to have a following.

Outside of military issue, there are TONS of large expedition packs. I like an external frame pack, myself, but that is becuase they are more versitile and they keep your back cooler. Internal frames are lighter and less prone to snagging. I've heard for years that internals are more comfortable, but to me that says you aren't using a frame that fits your body. Which is the problem with milsurp frame packs- they need to buy a couple million, you can't have every grunt trying on packs until he finds one that fits. But since you only need to buy one or two, your best bet is to go to someplace like EMS or any of the other camping/hiking stores with an ok or better selection, and try some on. They'll put as much weight in it as you think you can manage, have them help you adjust it to your back, and spend half an hour browsing the store. Squat, kneel, bend over, maybe take the stairs. If after a half hour with the weight of your projected load plus a bit (10%, 20%, that's up to you, but trust me, it will get bigger) a pack that was comfortable isn't any more, it will feel like a death march.

(Didn't I type this someplace recently?)

I won't recommend one pack becuase that would be unethical of me. It is identical to recommending a chair to someone- you can't, you don't have thier spine. In this case, you also don't have thier shoulders, hips, knees and feet. Nor will I recommend shoes but by brand- I know what holds up, or what seems to hold up for others, but I can't in good faith tell you that model XYZ is going to be the one for you.