I own a 2.7T six speed A6, so naturally I am going to recommend this model. Even in automatic version, this is a great engine. The 4.2 has comparable power; however, I think it feels "heavy" in the front end. That is just my opinion. The best advice is to test drive as many engine and transmission options as you can and decide what feels best to you. All the A6 models are great.
Good luck!
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