You can fit a Dension GW100 for a fraction of the cost, it will work with your current HU and although you lose the 6CD changer you probably don't need that with an Iphone. The GW100 also works with the Iphone 5 and lightning adaptor. You won't get track names on the nav unit, but you will get them on the DIS and allow you to fully browse your Ipod/Iphone from the steering wheel and stereo controls.