Keep in mind that these cars are light and the smaller width tires will give you better traction (more lbs. per square inch of tire contact).
Also, the VW drivetrain/suspension, for several reasons, doesn’t like too large of a tire. I’d search for some P165/80’s or P175/80’s on http://www.tirerack.com or http://www.discounttiredriect.com not anything larger or with a smaller aspect ratio.