[914Ghost]

Rust.
and dont forget to check for rust. Then check again. Is there rust? Go check!
After that check for body damage, you know- bondo, wierd gaps, overspray. Hows the inside?
Hows the brakes?
Suspenciono'? And THEN hows it run and drive? Recods? Modifications? History?
I'd guess almost any 912 that hits a 7+ on a 1-10 scale all those things is worth in the $7-$11k range from what we're seeing lately. rust is the biggest Killer of the deal. I'd say body damage 2nd, and mechanicals 3rd. Actual appearance is soemthign I wouldn't worry about. Nic's and scratches, a ding or two- no trouble in my book. Just shows its been around.
The mechanicals ARE expensive, but you can screw those things up over and over and not really effect the overall condition of the car. Rust and / or Bad or hidden body work can make an otherwise great "looking" or low miles or great running car a parts car.

Bob O