You should look at one of these Hudsonbay...

http://www.online-caraudio.co.uk/shop/cd-m...0bt-680954.html

This will link your ipod (assuming it's a bluetooth model) & give you bluetooth phone capability using a wired noise canceling mic. This site is a good price too!

I considered one of these, but I do so few miles in the S that I couldn't really justify it.