Check for crash damage as so many have have crashed
Check the car stears in a straight line and brakes the same.
Have alook here
http://www.cliosport.net/forum/showthread.php?t=108607
Front wings never match the rest of the car particulty silver ones (some Cups came in silver and some with climate control)
They rattle a bit just the way you might get a good one.
Check for curbing damage as this affects the tracking.
Check for any splutters between rpm they kick at 4k or so due to the cams beicoming more effective and the ecu mapping but there should be any 6k stutter or 3k stutter.
Idle isn't good most notiable when cold them optimax helps though.
make sure its been serviced at 12k not the 18k some dealers try and convice people to be done at.