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I've finally found a pack that seems like a good choice in the 55-65L range: the Eberlestock Destroyer.
It's a conventional backpacking configuration, 60L, rated for more weight than you'll ever fit in it, adjustable internal frame, hydration compatible, PALS webbing to attach expansion pouches if needed, lots of core pack space and very little inflation of the stated capacity via mesh and zipper pouches. Few if any gimmicks, simple aesthetics (neither military LARP nor San Franciscan hipster) looks tough and quality, good reviews on a site where those are a little more trustworthy than, say, Amazon.
Downsides: Expensive and heavyish (7 lbs.) by popular standards. Personally though, an extra 2-4 lbs. isn't gonna kill me.
