I don't know how much help i can be here, but I'll try...
I live in northern MI (Traverse City area actually), and there is one car audio dealer here that people go to for high-end installs. They all go to Kurtz Car Stereo. I had the stereo in my Sebring installed there. They are very competent (?sp), and sell some of the best brands around (I highly suggest Focal for your speaker choices, and Xtant amps and subs). One of their installers just left, but was replaced by another top-end installer. They have have been in publications (please don't which ones, because I can't remember the name), and I full reccommend them.
If you want to contact them, the info is below. Ask for Jensen (pronounced yen-sen), and tell him Aaron Steele told you about them. Whatever you need done, I'm sure they can do beyond your expectations.
Kurtz Car Stereo Center
1201 E Front St
Traverse City, MI 49686
231-947-1124