Bmw 330D, re-mapped will do 150+, and give the M3 a hard time.
Is/was a vid on youtube of the 2 racing.
If you're getting a diesel, Bmw are making some of the best, and 6 their pot diesels sound nice, which is a bonus.
If your budget would stretch to one.
Not sure the 2.5 Audi is that great for MPG?