Well, I just did exactly that... looks like several people are interested as I am just going thru and helping answer questions and this seems to be a theme. Sooo...
I swapped my '04 in dash changer for a 2006 In Dash changer. I got a NON audiophile unit and it is PLUG AND PLAY with an '04. From what I read, an '07 uses a different antenna connector.
I used EBAY - and added the factory Sirius tuner as well. All I had to do was trim the yellow plastic away so I could install a generic Sirius antenna that I got from a local stereo shop.
Best part is, I can fully browse my Ipod with the adapter I got.

I just did a review of it if interested- don't want to type it all out again.