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I would go for a 252 PS A4 Avant over the S4 not many about though.
This one looks like a good example
http://www.autotrader.co.uk/car-details/202106103698936?atmobcid=soc3
This one looks like a good example
http://www.autotrader.co.uk/car-details/202106103698936?atmobcid=soc3