hey,
Having worked in the motor industry for years I'll tell you now that nobody will take any notice of parkers guide or any other price guide for that matter, I know it's a private sale but pay what you think the cars worth and if it's mint expect to pay a bit more. I've got exactly the same car and if somebody tried to offer me parkers pricing I'd be insulted. Sayin that tho if the guy who's selling it isn't into has (or her) dubs then you might pick up a bargain.
hope it goes well, mystic blue looks awesome in the summer sun! 
RG
Hey rgibo
Your advice is appreciated! I've been looking around and I must admit that I haven't any decent golfs that come anywhere near the book price.
I'll let you know how I get on.
Cheers
Lee