I have an 07 tb with the bose system. I dont use onstar so i am not worried about that not working. IN my last car i had a kenwood double din with the nav and ipod installed. I am looking to upgrade even more i want the nav blue tooh and ipod. Any good recomends? what problems do i risk coming across here. i am in the midst of droppin some money into the hood of the tb right now but i want to get started on the sound...wat u guys think?