Two of my friends just bought Audi 1.8T, do you want their phone numbers?
From what i understand, Turbo charge brings a very unusual characters into your car. On the good side, it gives a strong boost on torque in low RPM range, and fair amount of increase to horsepower on high RPM range. it is also possible to keep your fuel consumption down by not to exceed 3,000 RPM (vary from different car) where the turbo kicks in. Also 1.8T is cheaper than 3.0.