David, don't get too caught up in power ratings. Keep in mind that most of the time a speaker will be using about 1 watt at a comfortably loud average level. Unless the room is very large and the material being played has a very wide dynamic range it's unlikely that even brief peaks would use more than about 100 watts, if that. So no, having more unused power available doesn't improve the sound, simply because it's unused. The 3806 or similar should be excellent.

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Enjoy the music, not the equipment.