The size of the graphics card doesen't matter when choosing a motherboard. If anything make sure your case can fit the card.
and if I may ask why such a great motherboard but sell it short with a mediocre graphics card?
Sadly I have limited funds and I just bought this graphics card this summer. It would either be between a new graphics card or Windows 7(upgrading from Vista). Still running an awful 2.2Ghz AMD Athlon X2 series with an nvidia Nforce board. And because with this crappy micro-atx board I have, the card ended up being too big for the heatsink on the CPU so I had to buy a new, smaller one.