I've upgraded to the Discover Pro so am parting out my standard nav system. Would suit a TSi owner looking to upgrade and install Nav and have the option for a reverse camera.

Part numbers: 5G0 035 456 A

Will also include the fascia plate, although it's got the GTi trim. You can source a plain black one pretty cheaply if you wish.

Seeking just $600. These units sell for around $1,000 usually.

VW Central (or similar) will be able to install for you at a small cost. Happy to ship interstate.