The arguement that you don't go after a high-OBP CF/leadoff hitter because Billy may be ready sometime in the next two years mystifies me.
IT's not that you don't go after one -- it's that you don't go after a high-priced one that will cost significant talent. There's never a guarantee you can then peddle that guy to fill the hole you blew in acquiring him. Especially to fill a hole in the middle of the rotation.