Another fun '09 possibility is Jason Giambi, mile high version.
In the Western pinstripes, Giambino currently has an earth-shattering 1.458 OPS in 22 PA. There's a slim chance he'll make it to 50 AB and a far slimmer chance of keeping his OPS at 1.4.
Still, if he managed the miracle finish, it would rank as the greatest OPS in our game (current record is 1.422 OPS, Bonds '04). I'm hoping he does it, thus creating the greatest pinch hitter to ever SIM.