I just got the Sennheiser e901 e902 e903 3-904 2-906 908 AND THEY ARE GREAT.
Especially the boundary 901,the 906 and the 904.
There is such a clarity in the signal that one might think it is a studio condenser mic.I know it sounds strange but it is true.
I use them with 6 channel of Apogee MP...