hey diegmat, i've seen a few of your many posts and know that you're a big fan of the manhattan gmat books
. i've checked em out too in my never ending quest to get prepped for this ridiculous test, but i would caution you and anyone else to not limit yourself to one company's materials. i've found that diversifying my materials has been a big help.
in addition to having used the manhattan gmat books
(which actually aren't my favorite) i would recommend checking out the kaplan
materials as well as the manhattan review
materials. i actually found that the manhattan review
math book is really challenging when you're ready for the tougher math problems.