hi, i am new to the board. i am from columbus, oh. i am having a complete new system installed in my '05 navigator. this is what is being installed next week. pioneer avic-z1, bluetooth adaptor, ipod adaptor, pioneer back-up camera, steering wheel control, also a rear seat dvd with 12" monitor, all factory speakers are being replaced with infiniti component speakers, and an infinit power amp. i am having it professionaly installed by an excellent company(because i would totally screw it up, then get mad,ect, ect..) the total cost is $5,500.00 does this sound somewhat reasonable or in the