maybe rust in the hatch or had they fixed that problem by then ?
nah they fixed that problem. but the liftback models (sx)are common to have water leaks in the boot.check the carpet isn't damp. alos check for rust around the windscreen and sunroof (if it has one)
personally i would look for a lower KM one. its a safer bet it should be in better nick and more reliable as a 1st car.
Also find out who rebuilt the motor, and make sure it was done right.