Which free agent designated hitter should the Arizona Diamondbacks sign?

The Arizona Diamondbacks need a designated hitter. Fortunately, this free agent market has a wealth of possibilities.
World Series - Houston Astros v Philadelphia Phillies - Game Three
World Series - Houston Astros v Philadelphia Phillies - Game Three / Sarah Stier/GettyImages
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Arizona Diamondbacks general manager Mike Hazen is making steady progress as he works through his offseason to-do list.

Upgrade at third base? Done with the trade for Eugenio Suárez. Acquire a starting pitcher? Check that one off with the signing of Eduardo Rodriguez.

Still, one task remains: Finding that right-handed power bat, which Hazen has said will either play a corner or be a designated hitter. He also expects this to be the result of a free-agent signing.

There has been speculation the D-backs have interest in four possible designated hitters: Rhys Hoskins, old friend J.D. Martinez, Jorge Soler, and Justin Turner. Jack Sommers has done a breakdown of the D-backs’ current financial commitments, writing that they have enough remaining money to add a hitter, even as the team will probably surpass its previous spending.

So, let’s consider the possibilities. (All salary projections are from MLB Trade Rumors.)