I'd say make sure you get an '07 or later at a minimum. I have a friend w/ an '04 S4... and that car is a P.O.S.
His car goes into service every 3 months (Minimum)... I feel really bad for him... And his '04 A4 was the exact same.
I raced a '00 S4 Bi-Turbo with my dad back in 2000, and 2001... and the car was great... no issues... but it seems like they've had a bad spill of quality issues with the '03 and up...
But I only have my 1 friends car as an example, but I know he'll never buy another Audi... he asked his service advisor... if it's just his car... or if this is normal... his S.A. said... I hate to tell you, I have some that are worse than yours. uugghhh
But they look damn nice!
Dave