If I were you, I'd switch up a couple things. your PSU since it is a bit overkill, even if you get a second 7770 later. here's one that's on a great sale right now...http://www.newegg.com/Product/Product.aspx?Item=N82E16817139031
Next, I would get an unlocked CPU, you might as well if you're going to get a Z77 mobo.http://www.newegg.com/Product/Product.aspx?Item=N82E16819116504
Also, if you can afford it, look into getting an hd 7850. i think you'll be happier with it if this is a dedicated gaming machine for a 1080p monitor.