Should I buy a New Mic ?

If you make a tutorial and using voice narration for it, then you should make it less noise and of course crystal clear sound. But lately after make a several times recording (you know making a screencast isn't easy as you think), my sound was really pretty bad.

This what I've been used for my tutorial.

And after watch this,



I realize that I need to invest for a new mic? So, any recomendation guys?

Picture by Aditia A. Pratama