I had the 1s decades ago, and am loving my 2Cs for the past several years. Driven them with a Denon (100W/ch), Krell (150W/ch/8 ohms/300W/ch/4 ohms) and currently a Vincent (150W/ch/8 ohms/300W/ch 4 ohms). Clipping never happened, the only difference being the sound quality markedly improved going to a better amp. I don't know what levels you consider satisfying, but at what I consider satisfying, (peaks of 85-90 dB), I would say you should be ok with 100W/ch. Last but not least, did I mention I LOVE my 2Cs?
Tom
Tom