yeah, both s6 and m5 are out of my price range atm!
i like the look of the e39 but can't help feeling the a6 saloon is the much better booking car, especially in quattro form as it's lower with the five spoke wheels.
bm being better spec'ed? probably true but there some quattros out there with the sat-nav/tv option, while most seem to have bose audio, leather, electric seats & air-con.