Guitar, the M22's will give you a better sonic match to your VP150(same drivers) as well as more midrange support with the two woofers vs the M3's which use a single larger woofer. If you were to stick with the M3's(an excellent speaker) I'd go with a third M3 as center for the best timbral match on the fronts. Just my opinion, of course.

Half of communication is listening. You can't listen with your mouth.