Only thing similar as far as power goes would be D-Sonic. Their lowest powered offering is 400w/ch and they go up much higher than that.
As far as sound quality, I think its just a matter of having plenty of power...at normal listening levels it should sound the same as the amp just amplifies a signal. If you don't have enough power, more may help if the speakers can actually handle it. Keep in mind however, that more sensivite speakers can be an effective approach as well. Adding 10 dB of sensitivity would require 10x as much power to match, and speakers will only handle so much power before substantial distortion and compression set in. Doubling power only gains 3 dB and quadrupling adds 6 dB, again, only if the speakers handle every drop of that power without distorting and compressing, so actual gains will likely be much lower.