there was a mystic blue one on ebay with 58,000 on it but it was auto with grey leather and started at £950.Got no bids after listing 3 times.
Personally i think it will be a long long time before any mk3 is worth an interesting amount and in reality it would be the earlier one's that command a good price as there are less exceptional early one's around than the later one's.Limited editions would be the exception of course subject to mileage,condition,history etc.
Value always depends on numbers produced.Mk3's were made in vast amounts like many other 90' cars.The fact that they are so reliable is also their downfall as far as investment is concerned.