Should i trade Furcal, Chris Young and Dave Bush for Gagne and Troy Glaus (There are some good FA Pitchers)?

I think it's a bad trade for you. Dave Bush is an underrated pitcher who I believe is going to have a very good year. The two players you would be getting in return are both injury risks, especially Gagne. When's the last time Gagne threw a pitch in a major league game? And if he struggles, Otsuka is right behind him. I say look elsewhere for a power source. If there are pitchers of that caliber in the FA pool in your league, there's bound to be some power too. Good luck.