Hi Mark
Welcome to the forum! :D
If you're looking at a 2.7 (187 bhp) might be better looking at a 3.0 (242 bhp) but all down what you want, MPG ect, Quattro is all wheel drive so great for all weather, Audi are famous for their Quattro spec, the S-line is there top spec, so more sporty look (sports trim) . Hope this helps.
Also roughly what age you looking for?
Regards
Bradley