I paid $79 for a Motorola Luge Android 4.4 pay as you go smart phone at Best Buy specifically to use as a low cost media player with no phone service. I have it connected via Blue Tooth to my GM Bose "MyLink" Audio System. The audio playback is superb! It sounds as good or better than the other resident audio sources that come with the vehicle (XM, CD, HD Radio). Media Information is displayed via BT to the "MyLink" Console. Limited navigation and media selection can also be performed via BT.
Seriously, I was amazed with the performance of the $79 Luge being used as a vehicle audio source. I really doubt that Sony's $1200 product would sound or perform any better.