100k vehicle need timing belt and pump belt change, so make sure you know the cost in advance, or negotiate that in the price.
I find the very early models have more issues than the 06 or 07 models. Door locks, electrical, water ingress and bushes etc. Some early ones may have missed the Vehicle Enhancement Program as they would have been out of the dealership workshops by then.
They can be expensive to run with as little as 22mpg reported. Be prepared to spend out over the first year to get it right, and find an independent with IDS who can perform all the software updates and will fit EGR blanking kits (only possible up to around the early 07 - EU3 emissions) and a good remap to get the power delivery up as well as the fuel figures.
Avoid the manual gearboxes as well. They can mess you about at the clutch.