I just purchased the Sony MS908C mic for my VX-2100, and it sounds good, but I still need to figure out where the set the peaks for the manual recording level input -- I recorded one show and didn't have the levels peaking very high because I didn't want overblown sound, but during playback, the audio is noticeably low.
At another show, I tried increasing the peak levels almost to the point of going into the red, and it seems to sound better.
I have a friend who purchased a mic similar to the one in the second link above and his also sounds very good, but if I'm not mistaken, that's a mono mic -- I had to split his audio into 2 channels for pseudo-stereo when I transferred one of his videos to DVD on my computer, because there was only one channel.