I recently heard the Jeff Rowland Concerto Integrated Amp in my system and I am stunned. I am convinced that this amplifier is surely one of the best sounding piece of audio gear I've ever heard.
The build quality is phenomenal, has plenty of inputs, at 250 watts per channel, it will drive 'most anything, phono stage is as good as many of the "best" separates.
If there was ever a piece of equipment that I feel will successfully replace separate components in a high end system, this is it.