I have 2 MS mic pairs I like for MS: the U195 and 414, or a pair of Rode K2s.
Drum room mics, percussion, xylophone, strings, echo chambers; I've used these mics in MS with nice results. Pretty much my rule is, for clarity, I'll use the SS mics (strings, ambience) into Grace pres, and for character and power I'll use the tube mics (drums) into 1073 style pres.
I love the powerful sound of mono, MS is a natural extension of that sound into the stereo field.