A friend whose judgment I trust has recommended a pair of the 350s for my Magnepan 20.7s and I'm very tempted but I do wish there was something between the price level of the 275 stereo and 350 monos. It would be great if the 275 stereo could be converted to a monoblock for example. I just don't think the 350 monos are in the cards dollar wise for me. I may at some point seek out a used pair.
That's where I'm at. I could purchase the 350s but think they are overkill, the 275 would probably suffice but would prefer something in between.