According to Axiom the W22 is still within 3 db at 60 hz (researching for my own knowledge today) but I doubt they're as good as M22's, as you say.

aspicer, I faced the identical decision a few months back. I went with the slightly smaller screen and wall mounted setup, mostly for aesthetics, and it was cheaper too. I don't have a giant room to fill either, how big is your room?