Buy one from PS with the 30day return privilege and decide for yourself.
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I use SE100's with Wilson Watt/Puppy 5.1,s and am amazed at quality of sound they produce. I also tried an HCA2 for 30 days, actually I had two, the first one had a few problems which were addressed by the manufacturer with a new unit. The Monarchy's have more warmth and sweeter highs, along with greater mid and low bass. I wouldn,t think the bass would matter to you if you are biamping. These are the second pair of SE100,s I have owned in the past four years, I upgraded to the new model last year. These amps are very reliable and have plenty of current for your towers.
The HCA2 was very detailed but a bit thin sounding, and I could never get rid of the high frequency buzzing coming out of the speakers. I finally sent the second unit back and do not regret the decision, but it might sound better in your system. Either amp would be a good choice. Listen and choose the best sounding amp.