Today's Cerwin Vega isn't what yesterday's Cerwin Vega was. That being said, they do sound pretty decent for the cost. I'm running those same speakers, ordered the matching center, as well as Polk Audio surrounds. It's a VERY large sounding system, without the major costs.
Of course, there's better out there, but for music, CV is hard to pass up.
What's the flavor music you listen to? I ask, because it will help you decide where to go on the whole system. Some music is better with the old style paper cones, and some demand to be played on other designs.
Look below in my signature area and you'll see what I'm using. When I'm listening to music, I'm usually listening to Jimmy Buffet or somehting with a southern/country flavor. When the kids listen to music, it's usually this electronic garbage...but even that sounds decent on the CV speakers.