In addition to owning a pair of M3ti's I still listen to my old set of Sansui SP5500X's. They probably sound similar to your Advents so I think I have a good idea of the timbre you are used to. Going with the M3V2's and a decent sub you will sure to experience impressive midrange qualities. The M3's have an uncanny ability to be transparant combined with rich detail and retrival. The M22's are similiar but not quite as "warm". Both favor a forward presentation. It's your decision. As to a different center, I've made about three changes in the last three years and for me it has worked out fine. I won't give up my M3's for anything.
Rich (M3ti's, Aperion 5C Center, BIC V1220 Sub, Polk Surrounds)
