Thanks - I think you've give me what I need to know.
As far as matching goes, I really meant, have I done something obviously wrong like select rear speakers that are woefully underpowered compared to the front speakers.
And as for the receiver/speaker thing, I wanted to be sure I hadn't selected speakers that the receiver couldn't drive, which you've answered.
I'm going to see if I can go audition everything together and then take the plunge. Speakers are all in that 6-16 range.