Want Audi estate for my wife -- please advise

[notorious]

That is lovely example you provided Adrian.
Assuming RPM on top gear is low -- Ainars has taught me how to check this easily.
And perhaps we can stretch budget to buy out this example.

The only issue here is 'can I trust this dodgy s-stronic gearbox...?'
I can believe Ian and Roberto that ZF created bulletproof gearbox for A6 C6 that will last 'forever'.
But my mind is unprepared yet to see the 'outstretched hand of opportunity' in s-tronic cars... Maybe I'm an idiot...

This is damn good example though.
Where can I read about reliability of these s-tronics?

Adrian, because you know S4 Avant platform, can you provide search criteria for the most bullet proof cars?
For example S4 chassis XX, years from XX to XX, engine XX, gearbox XX.
That will remove many variables from equation for me!