I love my 95 993 but there are a few things that I'd stress.
1. Find out the history of the A/C system. If the condenser fan resister pack died and the A/C system got too warm (ran in stop and go traffic with the a/c on resulting in very high refrigeration fluid pressures), it may have killed the compressor and the forced a leak in the evaporator. Compressors are cheap, but you'll spend $4k having the evaporator coil replaced.
2. Check for rust around the windshield. 993s are known for rust issues in the lower corners of the windshield.
3. Engine leaks are a thing of Air cooled motors, so nothing new on a 993.
4. Engine harness recall, which was already mentioned.
5. Rear control arm bushing do wear and at 90k, you'll probably be replacing a few if not done already. Alignments are complicated and the most expensive of any Porsche due to the weissach link in the toe link and that it needs to be aligned under lateral force.
6. The clutch pedal has a kinetic link that needs to be replaced if the pedal does not naturally return to its normal resting place.
Yes, changing the oil is more work than a normal car (two filters and you have to remove the right fairing to get to the oil tank drain (it is in front of the rear wheel) but nothing that you can't handle.
I love my 993 and would buy another if I was in the market.
Enjoy
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