Jenny,
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, Kaplan800 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!