My advise would be to take your time and really have a good look around for a decent one - There are some about.
I jumped at the chance of getting a low mileage 53 plate STI for £10495 and as a result im still having problems with it - as we speak the car is with Subaru having suspension, ABS, Brakes and other small problems sorted, I have owned the car for 5 weeks and only now am I getting the work finally sorted.
It took 4 weeks to get the warranty details off the garage I bought the car from so lets hope its all covered.