MSI Z97 GAMING 3 vs MSI Z97 GAMING 5?

Solution
If the only thing you're concerned with between the two is overclocking then just go with the MSI Z97 Gaming 3 http://www.amazon.com/gp/product/B00K23BYBO. There will be no overclocking difference between the two. The only difference are the features included onboard.

Most of your overclocking potential will be determined by the CPU itself and your luck of the draw.