USB / In-Dash Navigation question

Hey there. New to the forum. I picked up my 09 Malibu LT2 last night. I traded out of a leased 2008 Dodge Charger R/T. I already miss the mygig touchscreen navigation I had. I had done my research, and I saw that some of the Malibu's have the radio with the USB port on the front. Of course the dealer I went to didnt have any on the lot. I asked if I could replace the stereo with the new one because I want the USB connectivity for my iphone and the sales manager said it isnt possible. This seems like BS me. Does anyone know if it's possible to order the newer radio with the USB and replace the one I have now? I have the single CD player now, and I guess it displays directions and stuff from Onstar? I know with the Dodge radios they were pretty simple plug and play to swap out the different versions they had available. How would I go about findind a part number and if this is even possible?

Now to the 2nd question. If I dont replace the radio with the one with the USB port, i'm seriously considering a touch screen. I've been searching on Best Buy and Crutchfield. Best Buy doesnt even list the 09 Malibu to check for compatibility and I'm not seeing a whole lot that will fit on crutchfield. Anyone have any suggestions for me?

Thanks so much.