Belts aren't an issue on those, but it should have had one by now,
Firstly, pop out the rear light clusters with the ignition OFF, if there is a bulb dimly lit, then it needs a rev counter, £150 from dealer (£20 - £30 off fleabay),
Next bounce on the corners of the car, any sqeaks or clunks and your looking at suspension work needing to be done, the age of this one means it's just coming up to suspension bush time £150 for the parts and a good days labour (my rates are good though
Airbag light, that'll need a reset normally, but always worth knocking a ton off the tag incase it's any more (never is though),
Check all the electrics work, anything not operating as it should then ask how long it's been like that.
Test drive, pull off with no revs and just let the clutch up slowly, feeling for judder that is not engine speed related,if that's OK get the engine right up to the red line and see if it hesitates at any point andcheck for smoke behind you, also observe the dash for warning lights, if you can, get the fault codes read on the car, if there's none be suspicious, there is always something that will throw up a fault and normally it's a Lamda probe as they work so hard in the toughest conditions, but they are nothing to worry about, they do it all the time, it's the others that woud be of interest, I have posted a guide to the codes, just print it off and see what there is.
The only other niggle they have is the rear set belt female halves seem to break easily, this is an MOT fail and can take a while to find a new one cheaply.
But in all for £2500 if it's got any of those faults it's worth discussing a price more in your favour.