at the end of the day the pal there really is no telling how a car is going to behave unless you forge the parts yourself, i'd say anything with less than 2 owners, full service history with a high percentage of dealership stamps, MOTs with nothing but advisories, full reciepts of work carried out, examination of break down kit, you know when somethings been used more than once, HPI check, and type of previous owners.
mine had one from new but after i bought i soon discovered his son used the vehicle alot and did some backyard modding that has left lasting issues which i have just only rectified after 2 yrs ownership, its down to how you have examined the car, i would take Nino with as well mate to be on the safe side and hes got my number if theres any questions he cant think of the answer for and i work with another Dub maniac who has owned Dubs since the 1982 Gti so you can imagine he has that crazed look in his eye