The Audi S4 Avant is the high performance version of the A4 Avant wagon. For a price premium of 10K (over the standard A4), you get a family wagon with a muscular 340hp V8 rare for a station wagon. Don't be fooled by the low key profile, this is one of the fastest wagons on the market. The S4 is a good alternative to an SUV, providing extra room without the bulk. This model is scheduled for a significant update next year.