My dad has had a 1992 turbo version of one of these for about 2.5 - 3 years now and unfortunately HG failures are common.
His went 4 days after purchase and he managed to get the place that sold it to him to pay for it and give him a 6 months warranty on the car if i remember correct, final bill was around £800 as it needed head work.
If you want one of these i'd at least try to find a manual turbo one, with no blown head gasket or corrosion.
As Jez says, broken ones are money pits, and you can probably find plenty of not broken ones out there at quite nice prices with aircon, heated/elecrtic seats & mirrors, cruise control and the other common stuff.
Quite cheap to buy, expensive pain in the arse to fix, buy a good one or dont bother i say.
Dads car -