I bought a MacAllister (blue thing) from B&Q, it was £39 and i clean 3/4 cars every day, 7 days a week.
Had it since the second of January and its still going strong. If your just using it to clean your car once a week, it should last a lifetime!!
cheers fletcher, but what karcher am i lookin for, i dont know what attachements etc i need and what one is the best value for money.