Blue Saber said:
What do you mean?
What I mean is that micro atx are generally designed for small form factor cases. For instance someone wanting to create a lan party system or have a case that fits into their entertainment center. With a larger case like the one you have chosen you still opted to go with a micro atx motherboard. The difference being with a micro is there are less expansion slots. In the future if you wanted to upgrade to say sli/crossfire you would not have the additional slots required. Also it gives you more room for ram, etc.
Here's a typical atx mobo that everyone usually goes for on a budget build.http://www.newegg.com/Product/Product.aspx?Item=N82E16813157271
That board will enable you to utilize pci-e 3.0 in the future as well.