Don't listen to people, everyone I spoke to before I got my GTI told me that they cost a fortune to fix amongst a bunch of other stuff, even tho not one of those people had ever owned a mk4, or any kind of VW for that matter. You might pay extra on shipping for some parts but it's nothing over the top like people make it out to be.
150-200,000k should be ok as long as it has been looked after by the previous owner(s).
I haven't had any serious problems with mine personally and I think they're a very reliable car.
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