Rotor tips and water seals are the common problems, either of these go then it's can be an expensive bill. Not too difficult to do yourself though to be honest if you're on a budget, a mate of mine has just rebuilt his and the basic rebuild (reused rotors and rotor housings as they were within tolerances) was less than £1500. The most work he'd done on an engine previous was probably change the oil!

http://www.tuneruk.com/forums/showthread.php?t=1875

As Chip says, awesome handling cars and I would argue you get more for your money than most cars around the same price. Regret selling mine!