Now, this sounds like good reasoning. Anyone have other opinions on the archer build?
The archery build is better.
If you intend to play an archery ranger, there are two styles of play you can go with in combat. You can fight on the front lines, or you can lurk in the back.
If you fight on the front lines, combat mobility is a good feat. Toughness is a good feat too, of course, but chances are you'll want both. The larger off hand weapon is pointless because you're already built to use arrows in melee reach. The paragon path qualification is useful.
If you don't fight on the front lines, combat mobility is pointless. Of course, toughness, while not pointless, certainly isn't that great. The larger off hand weapon is mostly pointless as well, because you've got better options to let you avoid melee and instead use arrows, which should rapidly become a vastly superior choice for you as your feats and magic items focus on improving your ranged attacks. The lack of paragon path qualification can hurt.
So I think that the front line archer wants the archery build, just because Toughness is the only good thing from the other build and that's available for a feat. The back line archer can pick either one, honestly, one way to get toughness and the other for better paragon path choices.
Personally I think the front line archer is the stronger and more useful style by far, so I lean towards the archery option.