Which of these four guys is the better fantasy 3rd baseman: K. Youkilis, M. Lowell, G. Atkins, or BJ Upton?

Kevin Youkilis is my favorite. The guy has racked up an impressive year of fantasy stats and he just keeps producing. Lowell is hot and cold . . .mostly cold. Atkins plays for a horrible team, as does BJ Upton, who is young and unreliable.