At your level, a GM fee is most probably overkill, and even a CM fee might be overkill. Of course, whatever the rating of your instructor, he must be an effective communicator of chess ideas.
Here's a link to some good, general advice on choosing a chess instructor:
http://www.chesscafe.com/text/heisman21.pdf
Well, i'm about to chosse go to the indivual class with a GM, which costs 50$ per hour. Or there is also an individual class with Candidate Master(CM), which costs 30$ per hour. What should i chosse? And does it worth it? Thanks in advance.