Thadar,
Many of the others here should cover recommendations on 2channel amps. However, I think you would be wise to hold off until after you get your M80s. That will provide you some time to test out the pairing with the Pioneer receiver and you can determine whether it will in fact drive them to acceptable levels. I suspect you will have enough power to drive the M80s unless you have a very large room to fill or like it cranked to 11. You may as well save the money if you can.

Scott

"Chickens don't clap."