My friend wants to get a Head Unit and use his Ipod. But he wants to use it through the AUX so that he has control of choice through the ipod rather than the headunit. Throw me some headunits or does it not matter at all? thanks.
Pretty much any semi-modern HU will have, or can be adapted (generally with a changer conversion cable) to have an AUX in. Give us a price range and any other things he's looking for in a deck and we'll give you some thoughts.
Good call on the AUX-In by the way, I still think that's the best way to run an iPod, at least as far as I'm concerned.