8455,
Because that's what I have/use.
Why?,
I like to take my time when installing now days and w/the built in amp I don't HAVE to run power/ground.... right away. I can do things right and still have the use of the HU. Anything over factory is better.
It also has an Audio input for ?? you want. Me, I'll be putting in 2 monitours for my kids in the back seat, and glassing one in my center console so the AVN, while nice, isn't needed for me.
I also run active and the 8455 has yet to let me down.