Should I trade Shonn Greene and Pierre Garcon for Joseph Addai and Austin Collie?

I shamefully took Greene with the 11th pick and am now looking to unload him for whatever I can get. The only thing stopping me from accepting this trade is that if LT goes down or becomes ineffective due to age, Greene's value sky-rockets. Is this a good deal for me or should I wait it out and see if Greene re-takes the starting job. Also, do you think I can get any value better than this at the moment?