From a defensive standpoint, I think it needs to be done. Howard was solid in the regular season, but I think his inexperience going for the Cup has gotten to him. He over-commits on first moves and leaves the opposition a wide open net. Osgood is, like you said, a proven winner, and was clutch during our last two runs to the Cup Finals. I think now is the time to let Ozzie play; he was put into the thick of the action in 2008 when we needed him, and lo, and behold, we won the Stanley Cup.
The defense as a whole must improve, but we need a stronger man between the pipes.