The 600 is sounding pretty good. I still have more experimenting to do. I haven't figured out good test material for gauging how quickly and tightly it is performing. Over the coming weekend, I'll put more time into playing with settings and going through my music collection. And thanks for the suggestion on the second 600. Wouldn't you know I've already been thinking about that. The basement plan keeps changing, but right now it's looking like a big wall will come down, making for a larger space than I'd planned on before. It's an eventuality, but I could see getting another 600 after all of the other stuff is done. Ha ha.