I can say this much with certainty: You will not go wrong with a Dana Terraplane, now available in a slightly trimmer version called the LTW for $439. Just a superb back, capable of handling 50- to 60-pound loads comfortably, heavier loads (God forbid) tolerably.
But then, the other packs you mention all are fine too. Both the Osprey Crescent 110 ($459) and Arc'Teryx Bora 95 ($395) carry big loads and have high-quality, easily adjustable suspensions. For sheer volume, the Crescent 110 is the winner, with 6,900 cubic inches of capacity versus a maximum for the Terraplane of 6,300 and about 6,200 for the Arc'Teryx. A lot would depend on how well the pack fits you -- have a shop load one with at least 30 pounds before you try it on -- and whether you find its arrangement of pockets and straps convenient.
I'll throw one more pack into the mix: Gregory's Denali Pro ($460). A big pack, with 6,450 cubic inches of capacity, and a suspension that matches anyone's. So you might give it a look, as well.
Other than that, my only advice is to do everything you can to trim pounds. Otherwise, man, you're gonna hurt yourself. And definitely invest in a good pair of trekking poles, such as REI's Traverse ($75). They'll help a lot with balance and shock distribution, and even improve your hiking efficiency. And once in camp, see to it that wife and kids take care of your every need. Foot rubs, back rubs, fresh-brewed coffee, the softest, flattest sleeping spot -- none of that is unreasonable for a guy like you.
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