Now that title is a bit of a mouthful!
Anyway, I have just ordered one of these:
It has GPS Sat Nav, MP3, MP4, Radio (DAB with an additional adapter), can be connected to front and rear cameras (available separately), steering wheel control programmable, can be connected to a USB hard drive full of your own music and video libraries and can drive two additional screens such as head rest screens for the kids.
What's more, it is branded. Most of you will probably associate something labeled as Joying 7" as something from an Anne Summers collection but they are a real firm and they do answer emails the same day.
The big draw to this one is that the screen is separate from the 'workings' and so can hopefully be installed where the oddments tray currently sits with no worries over depth.
I also intend to raise the HEVAC control unit up a slot to make it more accessible and have bought a single din oddments tray to sit below it.
I shall keep you updated as to its arrival and how I get on installing it all.