Ok, so I've got the new truck, and I love it. But of course, like any other truck I'm compiling my list of things I want to do to upgrade it. One of the things on my list is to add a navigation system. From what I have read, the existing radio in my 08 Silverado LT can be switched out with an after market double DIN system so that I can have a flush in dash system.

So, for those of you that have nav, did you go with OEM or after market? Why and why not? What did you put in, and what do you like/not like about it?