The only thing I know of that might get you past break even once you calculate in power usage is Gridcoin. And you certainly won't make a fortune in the short run with Gridcoin but from a speculative point of view, it's value could certainly rise in the future. Gridcoin leverages BOINC so at least you are doing useful work regardless of how much Gridcoin you are making. See http://www.gridcoin.us/ for more info.