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The A6 2.7t is a great choice. Good size vehicle and great power.
At 85K, the timing belt should have been done already. If not, you will be looking at another $1000+ job, but you will have a well tuned car then. The control arms and tie rods should be checked and, of course, you should have the car's ecu scanned for codes after it is driven for 15+ miles. Any issues with the turbos will be self evident or, at least, show up when the ecu is scanned for codes.
Good luck.