My perspective on it is stick with the 330. The S4 is fast, but it doesn't feel quite as "dynamic" as the 330. When I last drove a B6 S4 in March, it's fast, and the speedo and tach tell you that you're hauling, but you don't get much sensation of speed. However, the seats and all-wheel-drive are nice if you feel those beat the overall driving experience. I'd say the 330 is the best bet.