Kenwood DNX6140 installed in my 370Z with Sirius and back up Cam (AK370Z)
Do not let this scare you into not doing it, but it is a bit more than just pulling one in and out. AK also got a back-up camera added.
You can have stereo wheel controls but you have to buy some extra parts.
I think it is a nice upgrade, wish I had done it first but I am adding performance parts. I am happy with just my MP3 to Aux connection for the time. Nav I have done without for years and will do so until it finally gets added.