[huggy bear]

Alpine CDA-9820XM Integrated XM Tuner

Neato. Get this head unit and you won't need to buy a separate XM tuner. Saves weight.
http://www.alpine-usa.com/

Edit:

oops got the model number wrong. Can someone change the title of the thread to the correct model CDA-9820XM ?

 

[Joetz]

Corvette owners tell me that the xm antenna can be mounted under the fiberglass bodywork. If that's true, it would make for a very easy install on the elise.