having over 100k on a gti is not a problem, a well looked after gti engine will easily see out 250k, my 16 valver has 101k on it when i bought her last year and now has 116k on the clock and still runs like a brand new engine.
So do not be put off by a high mileage golf, as long as it has been looked after and serviced well, you will have no problems.
And good luck with the golf hunting

You have made the right choice!