oft02

I have a 2008 Audi TT. The telephone is not hooked up and the functions on the steering wheel do not work except for the volume and dial to change radio stations or tracks. It is the OEM multifunction stereo (navigation, satellite radio, iPod hookup, SD card slots,cd) but I want to replace it with something that has Bluetooth capability and touch screen navigation in addition to radio and iPhone functionality.
Anyone have a suggestion on a stereo brand and model?
Thanks in advance.