Yep, I have the Paradigm Reference Esprits and they do seem to go very low indeed. Have you seen how much bracing these things have? Build quality is excellent. The Paradigm Reference kit sounds completely different to the Monitor range, though.
I did listen to the Paradigm Monitor speakers (Monitor 7) and I found them to be somewhat forward and a little bright. Thats not to say they were bad speakers; I preferred them to B&W s2 603's. On whether or not they will suit a Yamaha amp/receiver, I used to have a Yamaha A2 and that was quite bright too. Perhaps both would make your system too bright?