Join Date: Aug 2007
Location: Montréal, QC (Canada)
Bikes: 2008 Surly LHT complete & 1988-ish fuglyfixed Specialized RockHopper
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Disc brakes are my favorite brakes... Had some on my "specialized sporty-looking hybrid" (a Sirrus Sport Disc) They perform really well, even in the worst of conditions... but they interfere with racks, both front and back. If you go with the DaVinci, check out the Axiom Journey Disc and the Old Man Mountain AC Low Rider, both of which are compatible with disc brakes.
But ultimately, I'd go with a steel bike with cantilever or v-brakes for touring. Steel has a better fatigue resistance and can be fixed should your bike break down somewhere far away from home. Some (including myself) believe it's more comfortable to ride as well - although that is most probably the most subjective of statements.
You might also look into the Surly Long Haul Trucker (which I believe compares advantageously to the Trek 520 - and that's a subjective statement as well) and the Jamis Aurora. I'm sure the Marinoni is a great bike. Spoke with a couple who had some the other day and they loved it.
I don't know the Norco, but if it's suitable for touring and you feel well holding its handlebars, it should be on your short list. After all, nothing is more important (apart from the bike not failing) than being comfortable.