Based on what I've read, the Manhattan 9-week course has the best reviews from people shooting for 700+. Although I was interested in signing up, the commute to LA would be a pain and I didn't want to commit the $1090. Alternatively, I have purchased access to the GMAX Online course and it's going great. The course contains 30 pre-recorded video sessions that are each about 2 hours long. It covers the fundamentals, as well as strategies, for Quant and Verbal. Best of all, it's $399 and you can complete it at your own pace.
I started this course after studying the OG11
and Kaplan Math Workbook
, but I'm still making improvement.
Feel free to PM me if you need anymore information on the program.
Good luck with your decision!