i have recently purchased a E250 Cdi coupe sport 2012 with what looks like the Audio 20 media option. im a little let down that this does not give me the option to connect either a USB, iPod, telephone or SD card in order to play music. I would also like to add some sort of sat nav providing this does not come at a huge extra cost. So what are my options? i am new to MB and the form, the bits i have read i am a little confused as to what would be the best solution for this problem. Any information would be greatly appreciated.