I agree with Bitkoinzz.
I have a dozen of these machines running, and more on the way. They will still ROI, and in just about 2 months at current price.
In my experience (I am running almost 3th/s currently, and have been mining for a long time) The Genesis block has never proven itself accurate on my equipment.
Wow that is impressive . You are running that much in your house? I am worried about red flags with the power company. I know a guy who ran 60 Butterfly labs 60gh and his electric bill $2000 a month. He got a knock on the door from the cops. hahha