I decided to book a course with Manhattan GMAT. Their approach seems effective and I have heard positive reviews from friends who studied with their guidebooks. They were extremely accommodating as well. I received a $100 discount and a free One Day Workshop for attending a free online informational session. They gave me book credits for Official GMAT Guidebooks I already owned, and discounted the newest edition (12th) of the Official GMAT Guidebook with which they are including a sheet that outlines every new problem added since the 11th edition.
I was particularly intrigued by their offered office hours each week. As a registered student I am entitled to a half hour of one on one time with instructors each week to help me through homework and other GMAT questions. Class starts in about a month and I will post updates on my general take on the process and quality.