I would have no problem at all with a device the size of my N800 or even slightly bigger with great video and sound, and also sporting full Phone capabilities. In fact I would have preferred a bigger screen. I wouldn't even feel embarrassed placing such device against my ear when making a call. :P Of course it could always be used hands-free. The N800 with the paired 3G phone is a bit annoying imo. A fully integrated single device as described above would be ideal for me.