well, for me. When getting a second hand car, don't go for the
cheapest, a 93 esi can cost from 20k to 40k, depending on
quality.
Things to check for: General body condition, paint condition,
visible dents/scratches, Interior seats condition,
speaker/stereo/HU condition, If possible, try to get someone to
check out the engine and handling condition.
Maybe some of the guys here can add more to the list.