Which is best (and why): lenovo y510p, sager np7358, or sager np8268 better?

I want a laptop for both school and excellent fps in minecraft. I've heard that the lenovo gets hot, but how hot would it get just for taking notes in class or playing minecraft? The sager np7358 is supposedly loud, but how loud would it be during school? And also, would the lenovo last two years? I plan on getting it at xocticpc with upgraded thermal paste and copper heatsink. How much would that help with the heat?