If going for an S3 s-tronic, the first thing you absolutely have to have is the new 7-speed wet clutch s-tronic box that works really well; not the old 6-speed wet-clutch s-tronic that does not drive nearly as well. Don't go overboard on silly big alloys with very low profile tyres because you'll forever be replacing expensive tyres and sometimes bent alloy rims as well. Magnetic ride is essential. Tech Pack if you want it.