I really like the looks of the N7 specs.. I use an ipad now for travel comms, skype, emnail, and light gps duty (trip planning) and I can see a 7 inch and 200 usd version being even more portable.
But for an actual travel computer, despite having great mapping apps now, the design of these is often a compromise for use while on the rd. Water proofing, power options, mounting options, etc.
I would have thought the ideal solution would be for garmin to sort out bluetooth and map / track / trip plan sharing better.. Plan with a tablet then simple share to the drive unit.