Do NOT go by carfax alone. I bought a car based on the dealer's "claim & reputation" stated on the web site & by a clean Carfax report, only to find out the car was pretty much totaled at some point.
Read the following thread for details.
http://www.volvospeed.com/vs_forum/index.php?showtopic=11716&hl=
Take somebody with you who knows cars & look closely for overspray, especially around the trim/windows.