Okay,

So I have the chance of getting 2 7950s at a good price (sub-$400 USD for the pair).

However, I am interested in calculating the ROI at the current difficulty. If it's too high given the influx of ASICs on the market, meh...

I'd like to do it based on $0.12/kWh and $0.00/kWh...

Any sites out there to help me with this?