Here's what I would recommend.

Get the Dension Ice Link Plus system for the iPod, which will give you song tags on the screen/MID. Also install the AUX for any other external audio sources you may want to pipe in (such as the DVD audio). That way you don't need a switch and get the best of all worlds.

(note that things piped in through the AUX only give you audio, but no display functions.)

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