Thank you all for placing all this into the right perspective. It's just that it's a lot of money (and form where I am, I can't count on a thirty days money back exit plan).
But instead of spending more by replacing the MicroTrackII with a PCM-D50, I now suddenly spend less by not getting the PDM661 in place. I feel better now, I mean it ;-)
So, I'll have to look out for the right cable, probably from JVC, and get some good gaffer.
Thank you all for your help and for your patience!