Sometimes you can't wait for a ppi, I lost a 3.6 turbo because I wanted to get it checked out first...lesson always give a deposit,
I understand completely - but if your serious, put down a deposit to lock the car in. I would have lost the RS if I didn't put a deposit down first. I get the price agreed upon with all of the details - then the deposit - then the PPI. If there are issues - the P.O. repairs them or deducts the cost from the purchase price. Or if its bad, you get the deposit back. However if the guy is shady - your not getting the deposit back without a fight and the whole thing goes legal. Usually a $500.00 check will do it - but if you have a bad feeling from the guy to start with - RUN!