The large petrol models will tend to be older, as demand post 2005 just died for those type of engines.
I would say with s-tronic in the A/S4 quattro models is reliable from 2011 onwards. The main change they made was to add a filter that became part of the service schedule to change - any earlier car that's had a box will have had the later one fitted, but if budget will stretch I'd be looking at the 2012 facelift I mentioned before with rectangular front fogs.
If the S doesn't float your boat, have a look for A4 2.0T but make sure it's quattro or it's got the CVT multitronic which is hateful.
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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