Dude go with aftermarket nav unit, kenwood, pioneer, eclipse are most popular, i personaly have dnx 7100 but im not biased. you can get a sweet setup with plenty of accessories you want plus install for less than 2k.
i read the reviews for them all on crutchfield, like what people liked and didnt like, and made my decision about the features that mattered to me. i recommend going and playing with some at the audio shops too.