I had earlier an ID40 in my 861 and I am sure that the ID40 was much better than MS600. I can not be sure but I think that the ID40 is a better choice compared to 218.

861v8+ID41, HD621, G98, Arcam P35, DSP7200SE, DSP7200HC, SW1600, DSP320.
2xMS600, 2xMS200, 2xDSP3200, AC200, Explorer2, 2x218, AD88, Prime, 251, 210