OMG, this is mad people's forum
First of all: any high end cpu/gpu of today (like the one originally posted) will perfectly run original release of BoB. Be sure.
Second: if the reason of getting a new pc is BoB, why not buying it as soon as it is released and tenths or hundreds of reviews will be available? You save money and you get best value for them.
Third: there are kids dying of starvation. Don't spend thousands of dollars for an extra frame in a game. Even if you donate to UNICEF, it's STILL a wrong luxury to aim for 123 FPS instead of poor 120 FPS...