I'm referring to Phil's first post. The S7. The Avalon 6 might work as well, and you might be able to get it a bit cheaper(than the S7) and its easier to fit on an ATX PSU. But i don't think you will ROI either way. Your electricity costs are too high, i think.
7 cent's is hard to say long term. Short term you are fine, so you could mine and sell. But if bitmain continues to drop price... you could lose this way. So there is a possibility of loss.
Both S7 and A6 have pro's and con's. The pro of S7 right now is price per hash. Pro of A6 is much more quiet and more traditional on amount of PCIe slots, and uses less electricity.
So it's really all a guess as I think selling would be involved in you hitting your ROI.