In addition to the points mentioned above (which are the most important points in my book) also have a quick check for:
Outboard mountings for the rear mud-flaps can rot out (steel and ali in intimate harmony, again!). Check for signs of leakage around the rear alpine lights (the windows on the sides of the roof).
With the engine, check it's not loosing oil dramatically and see what happens on start up. A puff of grey is acceptable, but smoking on throttle up or particularly when releasing the throttle may be a bad sign.
When pulling away, check for clonks, judders rattles and vibrations. It should steer staright and precisely, it shouldn't wander.
On the front axle, check for signs of oil seeping out behind the wheel - a clear sign that the swivel bearings may be on their way out.
It sounds like a big list, but to be honest, most of the above I'd look out for on any car.
Cheers
8)
Eeyore