I just purchased a CPO 2006 C280 4matic. It has the DVD Nav system and a single disk CD player but no satelite radio. My last car had satelite radio and I spend about 3 hours per day commuting to/from work and I want this option. The Mercedes dealer gave me a quote of $1500 to have this installed...that sounds pretty expensive to me, does that sound right? Is there a cheaper way to do it where its integrated into the existing controls on my radio/steering wheel, or is this the price i'll need to pay to have it? Thanks for your help!