In fact, you would absolutely not want a "higher power" amp, whether it be a power amp or integrated amp, if you have reasonably efficient speakers, and certainly not on a 91+ db. efficient speaker like the Sasha, as the vast majority of such amps use a lot of global feedback to control the circuit, as well as numerous output devices (i.e., numerous transistors or power tubes) to achieve high power. Feedback imparts a muted, closed-in, two-dimensional sound, and the numerous output devices reduce transparency and just generally muck up the sound on high-resolution systems. In this regard, it is frequently said, with good reason, that the lowest powered amp in a line of amplifiers is the best sounding one - the simpler the circuit, the better.
The new Rowland 625, the Ayre amps, and the darTZeel amps use no global feedback and none has a rated output of more than 300 watts/channel into 8 Ohms. Most Pass amps do not use any global feedback, and a few models have only three gain stages. The darTZeel stereo amp uses only a single pair of transistors per channel.
If you have really inefficient speakers (84 db. or less), if your system is in a really big room, or if you listen primarily to disco at 120+ decibels, then there may be a compelling reason to buy a high-powered (400+ watts per channel) amp. If, however, you're running efficient speakers like Sashas and have a reasonably normal room, high wattage is not what you want.
