Seach youtube for "ipad jk cop4x4" and you'll see the ipad option.
I'll tell you though, I just got a Droid X a few weeks ago. You can buy the car docking station, and all you have to do is pop your Droid X in it when you hop in and pop it out when you get out. The screen is a decent size, the included Google navigation software is about as good as anything else out there, and of course you have all your music on it. This looks like a pretty cost-effective option as well. I have the MyGig in my Jeep, but I'll be buying the car docking station for my Droid X to use in my other truck.