I've been using the Black Wolf Monashee (40L) for the past year or so and have been very happy with it.
Really good travel bag...I've lost count of how many flights I've taken it on. Small enough to be taken as hand luggage, and big enough to use as a standalone for short trips. Has heaps of practical compartments, good compression straps, a comfortable harness (well for me anyway) and is fairly waterproof.
The laptop sleeve is a stretchy neoprene-like material and I have no trouble fitting a 17" widescreen ASUS, so you should be able to fit yours too.
Downside it that it doesn't really have any good foam-padded compartments for carrying camera gear, so I have to carry my camera in its padded case which I then put inside the main compartment of the bag.