I wanted to buy M11 too for its speed, 2 cards, nice screen, 2.5 bal... but several people reported hissing sound on quiet tracks. Now what, well dx220 is out of my price range, so I have to investigate dx160 or r5... Anyone, any DAP in this price range that pairs well with S8F? ES100 is my choice for now. But I'll need a dap in the near future.