May I suggest that you skip the NEW cars altogether? I am sure you know that on ALL luxury brands you can save 5-10k by buying a slightly used Certified Pre Owned example and get the longer warranty.
Since you aren't looking at this car as a performance car, a CPO 2007 RS4 is out of the question then. They can be had for low 40s with around 30k miles and their CPO warranty is to 100k.
I would look at the 2009 A4 3.2Q and 2.0T Quattro. I would also look at the new TL with AWD (I think they are ugly as shit, but worth a look). The only lexus I would go for is the GS AWD, and Mercedes E350 4Matic. I HATE the IS and C classes. Maybe throw the G37 AWD in there as well. Good value . Also check out the Passat 3.6 4motion CPO.
Have you thought of the Q5? Great SUV.
With all of that said, I am a die hard VAG guy. I would look at the B8 A4 in 2.0T and 3.2 versions, the B7 S4 and RS4, the A6, Q5 and lastly the Passat 3.6 4motion. All in the CPO market.