My beast needed a bit of routine maintenance and other various issues/assorted work when I bought it. Bigglezworth provided some insightful which helped me make the decision to save it, however mine did not have the trans issues & had less than 100K miles.

Knowing what I paid for mine, I would say $6,000 - $7000 is the right price for 905147 considering it's condition and the documented issues. Depending what the dealer has into it you may get a great deal if not keep moving, b/c plenty of these beasts are coming onto the market and it's a buyers market for sure.

Once you get an RS6 it will be very rewarding to own from an enthusiast stand point, however buyer beware don't discount the cost of ownership too much just because you can work on the cars, some of the parts you may need to replace can be expensive & hard to source when you need them. Good Luck!!