The CS300 sounds fantastic paired with Tonian TL-D1s. As is likely with the Zus, their superior efficiency will give you more oomph, a more open presentation with better dynamics that, in many respects, better mimics a live performance than the Devores or Harbeths. The TL-D1s are my clear favorite, especially good for jazz, although the Devores and Harbeths will give you a harmonically richer sound that is quite pleasant. Tekton Lores OK and cheaper, but not as good as the others mentioned above IME, although I can't comment on the Zus which I have not heard.