yeah i work in car audio
and like some people said you can go with a regular deck and you will get a pocket dash kit that will fill up the entire space and the wire goes from the back, what we usually do is just run the ipod cable from the back of the deck to the glove box cuz you dont even use the ipod when you have it running on your deck you control everything off the deck ie: files folders and artist ect...
also to for the double-din it looks more vip since most high end cars have them and on the alpine ida-w205a we do the same thing run the ipod cable from the deck to the glove box since it has the same features as the regular cd deck and it is even more practical since it is touch screen...
some dvd touch screens you should stay away from(not bashing them it is my opinion) are pioneer,jensen,dual(made by jensen) and sony xplode
clarion is good but not very user friendly
also kenwood is good too
like i said i am not bashing the other ones for you out there that have them but i am a huge alpine fan always have been