Aftermarket cooler for MB chipset?

[BrowncoatGR]

I own a K9N Platinum and i am quite worried by the temperatures the NB reaches with the default heatsink(47C right now). I also want to overclock the system so the temps need to go down. I'm thinking of replacing it with an aftermarket cooler. Either the Zalman ZM-NBF47 http://www.zalman.co.kr/eng/product/view.asp?idx=200&code=014 or the Coolermaster SLC-S41-U1 W http://www.eshop.gr/show_per.phtml?id=PER.806078. Can anyone help me make sure either of these two will fit on my MB? Is it worth it? If none of these two fits does anyone know one that will?
Thanks

[YukonTrooper]

You could get a Evercool VC-RE which has active cooling already on it and you won't need to buy an extra fan. I am using it and it works great. The Thermaltake Extreme Spirit II also has a fan built in it and has heard it works very well.