Welcome to the site mate.
Pretty bullet proof cars to be honest, the engine is good and responds well to mapping, there isn't too much that goes wrong, you get the odd rattle and clunk from the suspension/drop links/bushes, MAF's can be flaky and coil packs are a fairly common point of failure but none of those things are mega expensive, in reality if all those things needed sorting you'd probably be looking at circa £200 for parts.
Depending on age of the car just make sure all the service bits have been carried out and on time, plugs, belts etc.. and you are pretty much good to go.
Enjoy.