Here's what I've been eyeing up...
http://www.amazon.com/JVC-KW-AVX840-Double-DIN-Multimedia-Receiver/dp/B004QY76G2
I like that its a true 7" double din display, and the face is detachable.
I don't know about GPS stuff, but as far as how it connects to the iphone and all that, I think I can figure it out. Or I'll just keep using my phone.
Plus the price point is right. And I want to use JL components and possibly the JL stealthbox
But I haven't yet pulled the trigger, so I am also curious what other audiophiles have come up with.