Why get a used one do you really want to trust someone again? buy an upgraded one or just buy a rebuilt one for 550 bucks
http://www.rabidchimp.com/mk2sup_60trimct26.htm
Well it says this is the turbo upgrade for a mk2 but it should be the same turbo that is on your car right now and you should be able to use it id call just to make sure email the or somthing...
http://www.rabidchimp.com/contact.htm
contact page if you want