Joe's advice seems spot on Darren, but you don't mention the mileage, nor whether you're thinking of buying from a Dealer or Private. Each will have their upsides and their downs but be more aware of the Private Seller as you will have no come back in the event of problems.
Now I'm no mechanical expert but as with any car I would start with the Service History (with invoices if poss) and be ready to walk away if there are big gaps unaccounted for or your questions are not answered both satisfactorily and convincingly. Look for any visible signs of excessive wear or lack of TLC like untended bodywork scrapes and dings, excessively scratched alloys, worn or tatty rubber door seals, uneven gaps in body sections, filthy engine compartment ... any or all of which might lead you to think that the car hasn't been well looked after. Then of course a test drive is a must when you listen out for unwanted noises and rattles, slack steering, loose or noisy gear changes, blue/grey/black smoke (especially when accelerating), spongy foot brake ... I could go on, but I'm sure you know by now what I'm getting at.
As far as I'm aware there are no known longstanding problems that should prevent you from both buying and enjoying a well-cared-for X-type ... just be careful.
Good luck.