LOVE my 45TX. I have M22's, VP150, QS8's and a VTF2 sub. I can't put it past -10...too loud. But I'm not sure if it's the speakers that are too loud or my wife yelling at me to turn it down...

I think either receiver will be fine. The MCACC on the Pio is a great feature. I know that Alan has misgivings, but it works great for me.