Dave, you appear to be paying too much attention to relatively minor differences in maximum power ratings. The increase in loudness with increases of watts is logarithmic, not linear; this means that the loudness increase(rather small 3dB)is the same between 1 and 2 watts, 10 and 20 watts, 100 and 200 watts, 1000 and 2000 watts, etc. There's likely to be no good reason to be concerned, for example, with 90 vs 140 watts, a bit less than a 2dB difference, which might allow playing a split-second peak at 107dB rather than 105dB.
