Seems like there's no such thing as a "perfect" headunit. There's always something missing or the feature is poorly devised or lacking. If they designed such a headunit with the following features I'd jump on it in a instant.

7" Double-DIN LCD screen
Navigation on built-in hard drive
DVD player on dvd slot
Juke box type player on built-in hard drive
Allows copying of mp3, wma, ogg files over to HDD
Allows you to rip CDs to mp3, wma or ogg files to the HDD on the fly
Supports mp3, wma, ogg audio files
Supports dvd, vcd, divx, avi and mpeg video files
3 sets of 4v outputs
Full Ipod support
Remote
Full EQ
USB port

 

Eclipse AVN7000
http://www.eclipse-web.com/7000index.html
I didn't have time to compare, but the avn7000 is very close to your description