I'd almost go Ward.
Depends what you need. Hightower is probably good for 10 carries, 20 yards (and a cloud of dust) and 1 TD (probably). The risk you take is not getting the TD.
Ward should get 50-70 yards outside chance at a score, I think he plays a lot as they rest Jacobs and blow out the Skins. Somethings wrong in Washington ... its not Portis, but everything else isn't clicking.
McGahee is all about risk ... a guy in our league is ready to kill him because hes sat/started him on the wrong weeks and the Ravens have been real closed lipped about if he's playing or not. Go for it if you really think he's going to get playing time ... but listen to the injuries reports closely - just assume he's always Questionable.