I have a Kenwood DNX 6160 and love it. Start time is around 15 seconds, it is a great head unit. I would recommend getting new speakers too, preferably components, they make a hell of a difference...
Very nice, I have JVC's double din touchscreen navi with the HD radio and the bluetooth and I love it. I ran a wire to hook my phone up, and haven't used it since I setup the bluetooth. JVC definitely makes some good products