If you are willing to spend the amount of money on a motherboard I would choose based on looks, or other features such as PCI-E lanes. Overclocking wise they are going to be the same and you will get about the same results with the Gigabyte UD4 or the Asus P8P67 Pro, unless you are talking about some crazy liquid nitrogen cooling
. So you might aswell save some money and invest it in a better GPU, which is far important for gaming.