Hiya,
If it's an estimate of the worth of the car you want, it's best to look around to see what other GTI's are selling for. We all know you can get tired old digs for a few hundred and spent up to £2k on a minter. The mileage seems alright (a lot of people seem to go for the under 100k cars, most of which are blatently false) but the number of owners is not so good.
FSH history is good, is it full VW service history at the dealers? This is better, money wise, for putting more in your pocket.
Again 8v's don't normally go for as much as 16v, but you've got a sought after colour. It's difficult without any pictures to go on, but you say that it's quite tidy but not mint.
What extra's does it have? I imagine it's on a 'J' plate, with run out specs. So BBS? Sunroof? Electric windows (front I guess?)
Any optional extras? Electric mirrors, rear electric windows? (God forbid) Air Con?
As a rough guestimate, I say that you're unlkikely to get more than 1.5k, but this is without knowing the full scoop on the car and not seeing pictures.
At the end of the day, somethings only worth what someone's prepared to pay. But MK2's are fairly cheap at the moment so it's not a good seller's market.