If you are going to use something like an iPod for a source, you don't need to buy a head unit. You can plug it directly into an amp or crossover and use the iPods volume control.
I believe that Naim supplies Rolls Royce and/or Bentley and both Lexicon and B&O OEM for a few brands like Hyundai and Audi. I'm not sure if any of this stuff is available in the aftermarket, tho.
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