Boy there are lots of things to check. If its possible I would get it on a lift. Here are a couple of things I would look for or consider doing if I bought the car.
Check the front end suspensions components including the struts and strut mounts.
Check the motor mounts.
Check the timing cover for leaking.
Inspect the motor particularly in the back of the block for possible head gasket leak. Check for play in the driveline and inspect the flex discs for cracks. Inspect the transmission front and back for leaks, check differential for leaks. Check rear axle boots for cracks/tears. Check all the fluid levels for proper level and condition of fluids. Run the AC/hvac the whole time the car is running. Drive it for at least ten minutes at operating temp. Drive it on the freeway as fast or faster than you think you will actually drive it. Check all power windows, locks, sunroof, radio, mirror, signals, cruise. Makes sure the odometer is working. Check the title, check the carfax.
That is about half of it.
