Of guys whose careers overlapped substantially with Sheffield? Do Rickey and Gwynn count? They overlap over 50%.
And if you don't totally ignore defense I'd take Edmonds and obviously Griffey... And at that point, you could point to the fact that Sheffield really didn't field well for most of his outfield years, and then if you lump him in with the guys who were all about the bat - Frank Thomas, Thome, Berkman, McGwire...
Also, I think Abreu belongs on your "pretty close" list...