Thanks for all your input folks.
I am going to do the OG in excrutiating detail and try to understand all the tricks that ETS has in its bag. It seems like I should take PowerPrep CAT 1 now, go through OG completely, and then take Powerprep CAT 2 just like Hong has recommended. I am planning to take GMAT in the Third week of March so I guess I got a bit of time.
I did finish Kaplan, Kaplan 800 cover to cover and Princeton Review Math and Verbal workbook. I also took the first KAPLAN Diagnostic (670) and CAT 1(640). By the way when are you guys planning to give your GMAT - I know Hong is taking it next week as he mentioned earlier.