First, good choice in car. Pretty much exactly what I want for my next car.
Navigation systems are usually expensive, especially if you want a clean custom installation. You'd be better off with one of those plug and play type units that can be updated by connecting them to your PC. Imagine a radar detector along with associated wires hanging off of your dashboard. Thats what they look like.
If I had to guess, buyin and installing a good quality Nav system would run around 2500 USD.
Also, if the car does not come with the nav system, I'd doubt the wires would be there for it. Though, i wouldn't be surprised if all it took was a different harness to be plugged in that shoul come with the nav system.
Do you have a nearby shop that installs stereos? Around me, all the big retail electronics stores will install nav systems. Plus, there are a few shops the specialize in installing stereos and nav systems. If you do, call and ask for a quote, if it's too much, try and haggle. I bet they would be willing to charge less to get your business.
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