if you're looking for a dvd unit, check out the new pioneer AVH 4400BH. that would be my choice if i was going to replace my deck today on my Z. buy it cheap through amazon.
if you're looking for nav unit, then i would go for one of the kenwoods as they have garmin built in.
but this day in age, nav should be either already oem installed, or taken from your smartphone. it's silly paying for updates. google nav is free and i found it works very well. i use in my G with a droid4 + proclip.
