Yes, the dvd restriction is easy to bypass on the N1 (just a ground you need).
It'll play DVD's, navigate (although, you can't plot a route and watch a dvd at the same time, you have to pick a route, let it save, and then swap in your dvd).
it's got inputs for a backup/reverse video camera, and a standard set of a/v inputs (for your ps2 or other media device). also has a set of a/v outs so you can hook up additional screens in the car, if you so choose.
it's really a nice unit. just a bit too much bling for me...