Hi coolisfool,
When it comes to studying for the GMAT, there are lots of options to choose from. It sounds like you're thinking about live classes, but there are other options to consider. There are online classes as well as guided self-study courses, which might better fit your schedule (especially if you work long hours).
Most GMAT companies offer free resources (practice questions, CAT tests, trial accounts, etc.) so that you can try out the materials and get a sense of each product before you purchase it. You should take full advantage of these options, then choose the one that best matches your personality, timeline and budget.
GMAT assassins aren't born, they're made,
Rich