the m3 is the ultimate when it comes to sports sedans. why get the s4, which is a wannabe m3. i mean it probably is a great car and i do appreciate its engineering. but ask anyone about the s4 and they will say "oh its audi's m3" not the other way around. get the m3 and you will never regret it. besides like i said chicks dig the bimmers. ask any girl what an s4 is and they will be like "s what?" ask them how they like your m3, and then you'll see. not that it matters, but hey its true.