Hi, So as the title suggests, Im looking to upgrade from my z506s to something bigger, Now. I know that the z333 and z623 and there, But is there any other types that would be better? I'm not to big on audio and dont really know what more "wattage" means. I would love to keep logitech since these z506s have been so unbelievably good to me. But i would also like to down to 2.1 channel and a bigger and better sub. Thanks!