I don't think Crawford has the arm. Beltran has the range, arm, and adds roster flexibility being a switch hitter. Drew and Cameron's contracts both expire, so they'll have the payroll flexibility to make this kind of move.
I realize several players have escalating contracts, but it's pretty clear they are mostly interested in the AAV relative to the luxury tax threshold, so most of those (everyone except for Gonzalez and Buchholz) are already figured into this year's number. I figure Ortiz and Papelbon, two more expiring contracts, are brought back for total dollars that are equivalent to what they make combined this year, assuming they continue to show they are worth bringing back, which they have done to date this year.
Beltran makes the most sense.