your queston regarding Usher dancer series would require knowing your room size, the tiny dancer works very well in a small room whereas the larger dancer series realy requires a much larger room. Many of the Usher speakers will work well with lower power amps but the dancer series loves power. Your mono blocks would be a nice match with the 8871 and we have powered the tiny dancer and a pair of 8571 with a big rogue stereo amp with very good results.
Dennis
Dennis