what are you doing with it? or how big of a screen are you looking for? Say the F series are the larger class at 16" screen the rest of the series are smaller screen.

the cw and the e series are just a matter of the screen size which is not much different and they both offer i5 cores which are good for a mid size laptop but it looks like only the e series are offering the upgraded graphic card but it's not that great.

If size is not a problem for you might want to take a look at the F series they are larger and has better upgrade options.

or if you want a smaller size like a 13"

take a look at this one http://reviews.cnet.com/laptops/asus...-34043767.html

it's the new U serie from asus that came out last month. It has a decent graphic card for gaming and also a 2nd integrated card for non heavy usage such as word or web browsing for efficient battery life