saddle tramp said:
Thanks, I wonder about the carbon fork handling the stress of the disc braking too...
The fork should be fine, otherwise Jamis was never spec the bike with it. If you're looking for a road bike with disc brakes, I would recommend looking into a cyclocross bike from Cannondale, Redline, Kona, etc. that comes equipped with discs already. A lot of the flatbar hybrids are built on the respective company's cyclocross frame or a variant of one of their MTB hardtail frames, and so have similar geometry and fit. If you're looking for bike to tour on specifically, a lot of these cross frames actually have rack mounts and are sturdy enough for most touring.
Converting any flatbar bike to drops and STIs is notoriously expensive. Along with the shifters, you'll need new cables/housing, bar tape, new handle bar, a new stem (unless you can track down a 25.4 h-bar that you like, I think Bontrager still makes one) and Travel Agent in-line cable leverage adjusters to make the brakes compatible with the levers. Not a cheap "upgrade" by any means. The labor will also be costly if you plan on having a shop do it and all of the above aftermarket parts will come out much more expensive than buying a complete bike with the parts.
It doesn't appear that Jamis makes a disc-equipped crosser, so you may have to look to another shop to get what you want. Decide on exactly what you want before you buy; big changes and upgrades will be much more costly later on after you've already made the purchase. Also keep in mind a shop will most likely be reluctant to do component swaps of this scale at the time of purchase; they'll probably do it for you, provided you are willing to fork over the money. Hope that helps.