Not sure if this is useful or not, but I was in similiar situation when I got my new Jetta. Wanted to get the RNS510 coz of the Satnav with integration but decided against it. Dealer wanted $3500 for it (because it would be dealer fitted).
Anyway, instead of buying a GPS unit, I decided to use my samsung galaxy SII. I really think google maps + Navigation is probably one of the best GPS on-the-go system out there. Searching is so easy on Google maps. Instead of searching for the exact address, I just need to type in, e.g. "Mcdonalds South Melbourne" and click on "Direction" brings up the route pretty much instantly.
The screen is large enough, plus you can stream the voice navigation over BT. I got a really nice/low profile phone cradle and mounted it on the dash just about the aircond vents. Bought a tom tom multi car charger (2 USB) for charging when I need it.
If you want a larger screen, there's the 5" Galaxy Note.
I'll try taking some photos tonight.

Originally Posted by
Transporter
Ok, some 3.5 years on and I just wonder what is the best stick on GPS now. I'm going to get 4.3" or 5" one for our Touareg, I had the Navman for 4 years and was not very happy with it, will go for Garmin or Tom Tom, their top of the range units have some very impressive features.
I'd like to hear some opinions from others who didn't buy the RNS510 are using.

MY12 147TSI Jetta DSG | CW | Sports Pack | Sunroof | Driver Electric Seat | RCD510 | Formula 1 Tint | MFSW Paddle Shifters
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