Probably not but 2 x 4GB kits are generally cheaper than single 8GB sticks and 4GB sticks are generally timed lower ( faster ) as well and why would you lose 5% in performance you don't have to lose? So there is no real reason to buy a single 8GB stick. If you later wanted to add another 8GB it can be hard to get mismatched 8GB sticks to work with each other too.
$46 if your stuck on Corsair for some reason. The GSkill is just as good and cheaper.http://www.newegg.com/Product/Product.aspx?Item=N82E16820233186
Either kit will fit under an aftermarket cooler.