I checked out the Walkabout Lite 4 at a Mori Luggage shop yesterday. It doesn't have a dedicated laptop compartment, just a gusset keeping the front pocket flap from opening too far.
At this point, I think I'm going to decided between one of the Travelpro 20" models (Crew, FlightCrew, Platinum, or Walkabout Lite 4) depending on how much I end up deciding to spend. From there I'll just go with the Eagle Creek Pack-It 18 inside as a make-shift suiter (and likely wear the coat on travel days instead of packing it anyway).