The same as eugenechiuu suggested for N53SV above, since both design is the same.
Go for Cooler Master U3, very reasonably priced for its performance.

It's hard to say which one is better, but I can say that Zalman NC2000 is a very good cooler based on the reviews from the users,
it is a bit more expensive, but I think if you willing to spend more on a cooler, Zalman NC2000 is very worth it.

Zalman NC2000 cools down a large area on the laptop while U3 cools down a specific small area on the laptop itself.
I guess NC2000 is better, but it depends on you whether you want to stretch your budget more to get NC2000?

And of course, talking about value for money, U3 is the way to go.

You can PM the seller at the following thread for best price.

CM U3 : http://forum.lowyat.net/topic/1345212

NC2000 : http://forum.lowyat.net/topic/1035022

And also maybe other forum member can provide latest pricing for these two notebook coolers?
I'm not in Malaysia currently so I'm not quite sure the latest pricing.

As usually suggested, U3 or Zalman NC2000, perhaps you can take a look at Notepal Infinite as well, depending on the vents location of your laptop.