I ran mine the same way but didn't drill any holes. I tucked the Ipod wire under the gear cover, if you call it that, and just dropped it under the arm rest cover. You can't see the cable because the seat hides it pretty good. My Ipod mount is still in the box. I don't want anything out that some SOB might see and bust a window to get. I just have to wire in my Passport now if I can find that thread.
I would save the money. The install is pretty easy if you follow Reed's instructions. It make take 2-3 hours. But if you have money to burn you could always ask your service department but I would give them the instruction sheet.