Welcome Kevin.
Ken is right. The EP125 will seem weak compared to what the M80s can do by themselves.
He is also correct in that you need to get some much thicker wire. 20 gauge is REALLY small. Maybe some low power HTIB would work with that, but not nice speakers like Axioms (or any major brand for that matter).
I've gotten away with 16 gauge for surrounds in the past, but ran all 14 gauge for my recent finish. Some people here will recommend 12 gauge as a "this will handle anything" kind of wire.
How long will the runs be from the receiver to the speakers? If it is a long run, then the larger gauge (smaller number) will be more important.
I wonder if you can use the existing stuff to pull some new wire through your walls? Probably not that lucky as contractors like to staple any wires down, but you might get lucky.
Check out monoprice.com for wiring as they have great quality and about the lowest prices out there.
Again, welcome.
