I ran into an old buddy at the gym, and it turns out that he and his cousin own this custom stereo shop in Long Beach, CA. Its called All Star Sound, Inc., you guys that are from over here should go check it out, they really know what they are doing. They also specialize in g35 coupes, as they have done many of the double din swaps on customer cars. They also have a lot of product knowledge and years and years of installation experience. If interested the address is :

ALL STAR SOUND, Inc.
6641 N. Paramount Blvd.
Long Beach, CA 90805.....its right off the 91 and paramount.

Ask for my boy Danny, and make sure you let them know that Mike sent you. Phone number is 562.630.6707

Hope this helps,

Mike