In my previous cars I always maintained an XM subscription to increase my listening options. I thought hard about paying the extra cost for the UHF audio (when I bought my car I think it was a $2500 option). I ended not getting it and I don't miss XM at all. I have all the music I care about and much more with Slacker and TuneIn. Plus I found the audio quality to be very good (note I am not an audiophile per se). Save your $$$ if you're on the fence and get the standard audio package.
Just one man's opinion...
Just one man's opinion...