External microphone - shotgun

[Kamelot]

Hello members,

I decided to buy external microphone for my 5D mk2.
Purpose is to avoid IS (24-105), focusing / zooming sounds and record more clear sound to concrete direction.

Would be great have stereo microphone and have modes: normal and tele or something similar.
Price range would be around 40 - 70 $. I don't need very expensive microphones like Rode or Sennheiser which costs 150 - 200 $ or more.
I made a little research of external shotgun type microphones and found these:

Audio-Technica Pro-24CM
http://www.bhphotovideo.com/c/produc...CM_Stereo.html

Audio-Technica ATR-6550
http://www.bhphotovideo.com/c/produc...icrophone.html

i am thinking about Audio-Technica Pro-24CM. It is smaller, has smaller battery and more clear sound (according to youtube). But i think, that because of lack tele mode it can capture IS and focusing sounds. So.. Audio-Technica ATR-6550 looks like panacea, but it is longer, has bigger battery (more weigth) and could be difficult to use viewfinder, if i want to take several photos and do not detach microphone.

Maybe here is owners of these microphones? would be great to hear advantages or disadvantages especially using on DSLR.
Maybe who could suggest any other microphones or share your experience?