Best player available

Here are a list of free agents available in my league. I have an open spot on my roster to pick up (1) player. Who should it be? I don't have any "positions" to fill, but I am needing a guy that can drive in runs, good OBP and high SLG%.

Players:

Marquis Grissom
Moises Alou
Edgar Martinez
Tim Salmon
Rocco Baldelli
Corey Koskie
Jeromy Burnitz
Melvin Mora
Morgan Ensberg
Brad Fullmer
Alex Cintron
Bobby Crosby


Right now, I'm thinking I should go with Grissom, Martinez, Burnitz, Fullmer or Ensberg(on waivers).