I paid £9700 for mine last May, its an 05, 52000 miles, 4 door, some basic extras, and that wasn't a bad price. Though this time of the year you should have no problem finding a nice one for under 10K.
Not sure about the things to look out for, just the basic stuff really, if its around 60 000 maybe a new cambelt (I didnt get that with mine) and look for condensation in the rear lights.
Good luck with your search.