I'll go counter to the prevailing opinion a bit, and say forget about the Co-Motions and Rivendells for a while. While I'm sure they make good bikes, you won't know what you want, or why, until you've ridden a road / touring bike for a while.
It's getting late in the season, but call around and see if you can find a dealer with a Trek 520, Surly LHT, REI Randonee, Windsor/Fuji Touring or the like, in your size and in stock. Go ride them. Pick the one you like the best, and buy that one.
I say late in the season, because touring bikes seem to be made in batches, and once this year's batch is gone, you'll have to wait until next year to buy from that batch. Buy one now, and the one you like, because you're going to need to put hours in the saddle to get ready for your trip. You may or may not be able to get one before next spring if you wait, and you won't do the riding if you don't like the bike.
Be aware, too, that if you put a heavy load on the bike, the handling will change.
Of course, you might get by with putting racks on your hybrid, but since that's not what you say you want, get the one you want (and like).