Cooling Fan Placement?

[NeonFlash]

Hi,

I have a cooler master elite 430 case.

ATI Radeon HD 5870 GPU

850W PSU from Corsair.

I am planning on adding a few extra cooling fans to bring down the operating temperature of my GPU from 80 degrees to somewhere around 70 degrees.

You can find the pictures of this case here:



Also, check out this thread:

http://forum.coolermaster.com/viewtopic.php?f=3&t=14545

My component placement looks similar to the image posted in that thread.

Where should I be placing the fans to bring down the GPU temperature?
Which fans do you recommend? Size of fans, Brand, Exhaust/Intake?

How effective are these fans in bringing down the operating temperature of GPU? Post your experiences

Thanks.