I'm getting the Gigabyte GA-Z77X-UD3H, since this model is latest than the asus. don't worry about the 2.0 slot form it..
If you got the gigabyte you can change the set-up to 3d bios automatically for (1st timers)
If you want to over clock set to this follow: http://www.youtube.com/watch?v=HIk-juTFqjE
don't forget to vote ^_^ if your satisfied.. I will check for more later about the issue...