Having sold them from new and my Mrs drives a 58 plate one as we speak, they offer bloody good value for money now. 2.2 is the way to go, make sure it has a full history, as they do like a drop of oil in their early days. As people have said stay away from the Petrol i-Shi*t version.
Best of the bunch is the ES spec as it has the most spec without having the Sat-Nag, don’t worry about the 17″ wheels, the ride is a little harsh, if it has 17″ on it make sure they are the grey Penta wheels as the others have a polished face and are prone to corrosion. If you are going for the Sport, the standard 17″ wheels are fine and dont really corrode unless they have been kerbed.
Any other specific questions, fire away!!!