Well, I wouldn't say "league champ" yet. You have a good team overall, but I think your bench is a little weak. There are several 2B better than Matsui, IMHO. Morneau also needs to get past the illnesses and injuries he has seemed prone to in the offseason. You don't have a 1B replacement if he goes out.
Otherwise, I think you're pretty solid. You just don't have much depth to improve through trades.