I just traded Ellsbury...along with Craig, actually. I also have Napoli, who is atrocious right now...and with his bum knee(?), I'd drop him if I were you. He's not looking like he's picking up anytime soon. Either Nap or Craig, who has been cold, and I'm not sure where the Cardinals are going to be in a month.
Are you looking to Ellsbury for an average and runs boost? Seems a shame that steals don't count since he'd be good for some.