mid 50s for a Granturismo s (4.7) or around 40k for a non-s (4.2).
These are the prices for oldest good examples which are 2008 cars. Brand new, the S is probably 90 to 100k depending on spec.
Ive never bought brand new. Always aim to pay 50-55% of original value once the car is at least 3 years old.
The Golf GTI is the newest car I have ever bought (Its Jan 2012). I paid £24k and it has 9.8k miles on it. But it came with a very good spec which included: full black leather, 18" shadow monza alloys, satnav, bluetooth, ipod thingy, front and rear parking sensors + reversing camera, cruise control, heated seats.
Im not sure if it was the best price but it was from the VW dealership in Reading???