Hopefully you will love it. I couldn't imagine waiting another 3 weeks. I know once I decided on getting a new Stang, I searched the net and spoke with several different dealerships over a 4 day period and that seemed like a long time!
I tried to retro fit the factory nav into my car, but it was more hassle then it was worth... It's made by Pioneer, so I know there is an unlock feature to use it while driving. I would just search and see whatcha find.