Advice for aftermarket deck or ipod integration for a 2004 pontiac grand prix gtp?

-I have a 2004 Pontiac grand prix gtp and I need to get an iPod hookup to the cars sound system. I would get a cd deck but don't know how to put one in when I have the air controls on that panel and I need to keep the 8 disc cd changer. Is there a stereo converter for my car that can fit an aftermarket deck and allow me to use the air controls as well as my cd changer ? If not is there just a cord I can install to my factory unit to allow me to hook me iPod up to it without losing quality ? Any help is appreciated thanks !!!Your air controls should be seperate from your stock stereo. I guess i don't get that part, but crutchfield sells Mounting brackets that will specifically fit in your car. find the new head unit you like and call them and tell them what you need it to be able to do and they will hook you up with a bracket and wiring harness so you can do it all yourself very easily. The wiring harness is around $20 and the bracket about the same. Just make sure you ask if the wiring harness will support your stock disc changer.