None of that matters. You simply do the math for when your miners will stop being profitable (when you'd stop mining), and instead buy btc and hold until that time. You will always end up more profitable that way than if you buy hardware to mine.
I didn't do this the first time and instead bought miners from KnC. I will now be lucky if I make half as much btc as I could have if I just bought it at the time I placed my order. The only true winners in the mining game are those who make the miners. The rest are just chumps regardless of how you try and spin it.