I bought the RNS510 from eBay... it came from Lithuania.. from memory, it was around $750 shipped..
I got it installed and AUS maps installed for around $200...
The install was pricey, but his rationale was that he had the official VW Aus Maps... and that's what he charges people..
I won't mention names, but he works at a famous VW mechanic/shop...
Steering wheel controls will operate radio, Sat nav but you'll need to install an additional Bluetooth module to A:operate phone & B:to use steering wheel controls subject to bluetooth unit you install.
If you do a search on RNS installs I'm sure you'll find the necessary information.
New to the forum, am about to pick up a R32 hopefully this week and the one I'm getting doesn't have a sat nav and I just want to know if I have to get an OEM one or can I get an after market brand (pioneer, jvc etc)?