I bought an audi and it doesnt even have the base NAV installed

I was looking into one myself. For about 200 you can get a Tomtom or Garmin model (Those are the only two I trust, actual milage may vary) if you want to replace your stock deck (Assuming it's double DIN) have a look at the Pioneer AVIC series (http://reviews.cnet.com/car-gps-navi...-32319805.html) you can usually get them used for a bit cheaper, the downside is it won't integrate into your cluster like the old one does.

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2003 Audi A6 2.7T
R.I.P. 2002 Acura RSX, Injen Intake, Sony Mobile ES XM7557 5 channel Amp, Clarion DXZ865MP, Focal 165V component speakers

ebay?

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2008 Tahoe LTZ blk on blk
Parrot handsfree bluetooth / GM Lockpick NAV hack module / xenon headlights / smoked tail lights / 20% tint all around / painted black badges / HID fogs

1800watt MTX amp
12'' MTX Sledgehammer Sub
Used to have:
2002 a6 2.7t s-line / GIAC / REMUS / AWE-Tuning s-flo intake / Forge splitter DVs / vast stage 3 tip chip /vast piggies / obx manifolds / samco tbb / 19''x8'' MMR wheels