[mpetry]

Craig, lots of good advice above but by far the most important is that you must evaluate the individual car and if possible it's provenance including ongoing maintenance, damage history, etc.

A car with low mileage may have been sitting for a long time - this is never a good thing, as seals dry up, bushings sag, etc.

A car that has been driven regularly with a big folder full of receipts is generally a good candidate. Avoid cars that are highly modified, or have been "stored for years".

911s are well made and the basic car will go 200K miles easily if properly cared for. My SC has 190K on it but just about everything is new and it drives really well. Also ask yourself how much maintenance / repair you can do yourself. Little things are easy to fix and you'll find lots of help on the PP boards. If you are not paying "a mechanic" to do simple things like oil changes a mid-year 911 can be fairly economical to own.