I'm not familiar with many amps in that category, but I have a rebuilt Counterpoint NP100 and the designer (Mike Elliott at AltaVistaAudio.com) makes the claim that his amps can drive a 2 ohm load all day long without wimping out. My amp is 100wpc and his other is 220wpc. He does have some new amps at www.ariaaudio.com that are 100wpc and 350wpc (I think...the 350wpc models may be monoblocks). I'm sure there are many others, but that's the only one that I'm aware of (my speakers' sensitivity is 89dB at 8ohm, so it's not something I think about often).
