Do you plan to use them as an intake or on your cooler? Either way, you won't be seeing much difference in temperature, and you don't need a cooler CPU, since you already have good control over that. The only reason you should bother getting new fans is for noise reduction, if you have too much noise with your current configuration. Given that, I'd definitely recommend Noctua fans over all others when it comes purely to noise reduction. They are brown, which some people care about, but they work great and are about as quiet as computer fans get. It's remarkable when you compare them to regular fans and listen to the difference at full speed for yourself. Here is a link to the Noctua equivalent of that Corsair you posted:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835608037
In case you need a different kind of 120mm fan, here is a filtered list of only Noctua 120mm fans for carious use types:
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007998%2050012454%20600035590&IsNodeId=1&name=120mm
The fans with blades like the one pictured above are just case fans, not meant for heatsinks or radiators (though they'll work almost just the same). The ones with wider fins that have less space between each fan blade are for radiators and heatinks (or drive cages, really any situation where something sits right in front of the fan). Good luck!