Rowand is a quality player, so is Greinke.
But Greinke>Rowand. However, Greinke won't get a lot of wins for you since we here in KC knows the bullpen will blow it. He's going to help you in every other categories. If you are going to get Greinke, consider trade Hampton(hot) for Victor Martinez(cold).
Don't drop Inge though, he's a stopgap in a lot of positions.
Are you interested in joining a 28 teams dynasty league? If so, PM me.