insurance is a big plus if your thinking of a 1.8 non turbo gti, as for some reason theyve been banged in the group 10 insurance catagorey, which is a good deal as for some reason the 2.0 gti is much higher and dosent have as much go!!, i have a 99 1.8 gti and have only had the common mk4 probs, (breaking window regulator, and rear wash pipe leak, and the infamous door hinge 'creek' which comes and goes, other than that no probs) as for mileage dont worry, these engines arent loos till 150,000 miles so even then you aint gonna have no probs, mine was 69k when i got 11 mths ago and now just nearly touching 80k, it runs fine and i do my own servicing so go get one there a good car mate!!
Gaz