Big Fantasy Dilemma???????///////?

Ok so I'm up by 6 points in a espn type scoring league. My opponent has Micheal Turner and Broncos D/ST left and I have Bears D/ST left but I have the option to pick up Falcons D/ST. I need a win desperately and don't know what to do. I'm thinking that if the falcons D do good then Turner is going to break out anyway so maybe I need to hold on to the Bears and hope? Opinions? I only have 20 minutes so please make it fast. Thanks guys.