I recommend AT540mr all the time, it has very good channel separation and tight channel balance, both important for tight imaging. Sound 'magic' is subjective, think preferred rather than better.
IF you could find a V15mr BODY, with broken stylus (like mine) ypu can buy this Jico stylus for V15MR body, SAS tip on boron. Very nice.
Boron and other 'stiffer' cantilevers yeild a bit tighter bass, subtle difference.
SAS tip, doubt you will hear any difference.