Thanks for the responses:
Don, I saw the powered peavy's at a local music store for the first time the other day...was wondering how they compared.

Denny, I swear I never saw these things when I was looking around for speakers. I search the Yamaha website alot too...How come they're not advertised much? or at all...
do they still sell them?...

Midnite. I have heard the MSp5's. In fact, guitar center in manchester CT uses them on many of the floor keyboard demos as monitors...They do sound great!