I think all I can add is.
Check for uneven tyre wear/scrubbing as it can be an indicator of poorly drivetrain.
A considerate owner will have matching tyres on both sides as allegedly mixing is bad for the VCU.
Also remember there are a lot about, so you can pick a good one.
think about what toys you want, my ES spec has cruse, 6disc changer, an Heated screen/seats all of which is lovely (not sure if thats all ES spec, headed goodies may be the Climate pack)
Also most people recommend a 5 door, obviously if you like the 3 dr then fine, but if you have kids then a 5dr may be the way to go?
Good luck.