My top personal choice would be Rendon, but with the Sox moving Moncada, I just don't see them jerking him around more. I think that ship has sailed. I'd love to see the Sox opt for a guy like Castellanos over Abreu for DH, but I doubt that'll happen.
Here are my guesses for 2020 FA, and the lineup by June 1:
Gerrit Cole: 5 years, $110M
Grandal: 2 years $45M
Abreu: 3 years, $42M
Justin Smoak: 1 year, $12M
Rotation: Cole, Rodon, Kopech, Cease and Lopez
Lineup: Madrigal 2B, Moncada 3B, Eloy LF, Smoak 1B, Abreu DH, Grandal C, Micker Adolfo RF, Anderson SS, Luis Gonzalez CF.
BN: Yolmer, Engel, Collins