You may not need "lotsa-watts" to reach your goal. You will need some current though. Watts are a product of Voltage X Amperage. Try a Parasound HCA-750 or HCA-1000 if you want ear-bleading (but accurate) sound at a reasonable price. The stated "watts" of receivers is often a number reached with less than a full range signal, a difficult impedance, or some other cryptic but legal-and-stated-in-fine-print scientific measurement. I install the Parasound amps in bars that like to "bump" with far less efficent speakers than yours.
Good luck!
Good luck!