Matt, I've heard the Boulder 865 & Vitus RI-100, however I haven't heard the Ayre. I like both integrateds. The Boulder has excellent control, bass, and sounds natural, whilst the Vitus sounds powerful, and has a warm, slightly dark sound I would say. The Vitus also sounds quite liquid, though not as pure as the SIA-025. As a rule of thumb, Vitus has good synergy with Magico, though I think it will depend on how each option sounds in your system. My advice is see if you can get home demo's if possible.