I have been looking at buying a Nexus 7 to use as a car head unit, but it is lacking in a few areas. The aim is to have GPS for sat nav, 3G (happy to use tethering or mi-fi, but internal would be good), and an external DAC for the audio. Would be mainly used for audio/navigation, but HD video would be played occasionally. The ability to add external storage would be a bonus. Although the Nexus is powerful, it seems I it won't support an external DAC and external storage (unless you root it). Can anyone suggest an alternative 7 inch tablet running Android 4 or 4.1, around the same price and capable of doing everything I have listed please? I'm not the most experienced Android user, but am in support and development, so enjoy the challenge! Thanks!