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Do it. B7s quite a jump up in the auxillary stuff - entertainment system etc. but essentially the same running gear as I'm sure you're aware.
When I was looking for the RS4 there were quite a few that looked good on paper in terms of care and maintenance but after a few questions over the phone I lost interest quickly. I was also after one that had been maintained by a specialist (MRC, Fontain etc) rather than an Audi main dealer as I don't have confidence that the guys servicing 2 litre diesels all day are best suited to looking after it. No offence to any Audi mechanics!
Sweet, I keep looking at B6/7 S4 Avants, but I'm scared of the engine popping, probably nothing to worry about if it's been looked after but scare stories abound. Might just take the risk, YOLO etc