Congrats! I'm the proud owner of an 8200 as well. I took a fist full of cables and had the installer run them all to my glove box for future use. This included a RCA (for video), HDMI, both usb's, and the aux. I haven't yet tried the hdmi, or plugging in two phones at once. I did see a you-tube video on getting a hdmi splitter so you can mirror, but haven't tried that yet either.
Watch this:
Hope this helps,
-PH