Guys, I've been studying for the past 3 months and my scores/performance seem to have stagnated. I'd like to get some serious help to push my score to the 680+ range. I don't have a lot of time to experiment different methodologies and test prep companies. I believe the most time efficient way to tackle this issue is to hire a private tutor and work hard on my weaknesses. With that in mind, I've been searching for tutors and I've come across a few:

MGMAT.com - Seems to have a very talented pool of tutors, however the hourly rates high.
790gmat.com -
testpundit.com
Princetonreview.com

I have not come across any GMAT buddies that have worked with tutors from the companies listed above. So, has anyone of you hired personal tutors during your gmatprep? What is your recommendation? Please share your thoughts and experience.

Cheers!