It really depends on you. Talk to several people and try what they are carrying. The Backpacker is relatively cheap, light, and it's acoustic. I also play harmonica (w/ neck holder) so acoustic is important. The downside: I can't play it (or the harps) during 'quiet' hours at the hotel. It sounds alot like an ukulele and the action and playability leave a bit to be desired (even after shaving the bridge. There is no truss rod). Will not cradle in your lap. You HAVE to use the strap.
I also have a Hohner G3T (Steinberger GT-Pro Standard). It's slightly smaller but heavier than the Martin. You have to have an amplifier of some type. I use the Epiphone Headjammer with earphones/plugs.
Pros: Looks cool and plays great - you can gig with it. 'Never' goes out of tune. Fold out rest allows the player to cradle the guitar on lap. Ultra-rugged. (Makes a great defensive weapon or canoe paddle and stays in tune). With headphones, you can play as loud as you want anywhere, anytime.
Cons: Heavier. Cost. Need for an amp. 'Special' strings (but minimal stretching when new).
I've also heard great things about baby Taylors and Tacomas.