If you can get a CPO, that can give you some wiggle room. Run the car through your usual checklist for a used car: should drive well, be free of any leaks or drips (except water from A/C

), be up to date on PCM programming, etc.
If everything else checks out, the spark plugs are a good indicator of internal health. Pull, check, and document. If they have not been changed, go ahead and put in updated plugs. Note any oil in the plug wells as an indicator of valve cover oil leak (rare, but good-to-know).
Peeling chrome taillights are a big cosmetic issue. Check closely.
Chaffed knock sensor wires are sometimes an issue, and can cause loss of power. Easy to fix with electrical tape.