Power is misunderstood by some I think. The power drawn is directly related to the volume level. A 2W amp doesn't drive the LCD-2 any better than a 10mW one while being played at 1mW just because it can go louder. A good number of companies have made a living selling really high quality low power amps because in the end not everyone can use 1KW mono blocks
In the case of the LCD-2, HeadRoom measured it at
120mV to get 90dB. I'm more concerned with buying the best amp overall than whether it can reach 130dB... something I'm never ever going to do. To be clear I am not saying that high power amps are bad by default, many of the high quality amps also tend to be high power but to buy an amp based on power output alone?
That said, of the amps I've had since the LCD-2, the B22 and Burson have been great. The Burson plays more to the LCD-2's speed and razor sharp transients while the B22 has greater extension while rounding out that sharpness to be more refined sounding. Layman's terms... rock vs jazz.