I'm about so start the same project so I've been playing with a few head units to decide.
I don't believe the app radio is ready yet. The interface and apps available are both lagy and bugy. Possible just needs a software update, but most likely I'd wait for a version 2.
I'm leaning towards the JVC XR810 right now. Double din, Bluetooth to support multiple cell phones. Easy to change the colors to match existing light. Great reviews and only $200 on amazon. While it doesn't have a touch screen, I am not certain a touch screen would add any benefit to my current setup.
I would go with the SOS console, unless you need the ashtray. If you want to go back you can. If your center is in good condition you can always resell it.