Feeding speakers rated to 125 watts with a 200 watt source is not a problem unless you are in 'Stereo 5' mode and pushing things hard. Even worse is driving 125 watt speakers with 50 or 100 watts and pushing things too hard. Why is that? Because, while in the first scenario the speakers will be receiving perhaps too much clean power and overheating, in the second scenario the amplifier will get well into clipping even before the speakers accept all they can - hard, nasty-sounding clipping can destroy some components of a loudspeaker and/or its crossover network in quick order. Also, some of the 'cleaness' of using a high-power amplifier is that high frequency transients being added on top of other lower but larger amplitude frequencies does not either overtax the power supply nor cause minor transient soft clipping. If your budget allows, use the higher power all around and behave yourself!