Microphone for Youtube Recording

Hello,
I have been trying to research this a little but not finding what I need so far.
What kind of microphone should be used if I am say reviewing my system for YouTube and I play a few tracks and want the best possible sound to come through to the end user, so that they can get a feel for the quality of the system?
I realize you cannot fully realize the quality of a system through Youtube but i am referring to something better then the Mic on a cell phone or my DSLR.
I have seen some Mic's that are referred to as Shotgun Mic's, would those pick up in Stereo?
Any info would be greatly appreciated.

Thanks
Jay