With 4 open spots I would add Romero, Jorge, and Garver. Leaving a spot open to pick a guy in the rule 5 draft.
I would also DFA Bosher, as he is likely the 4th best lefty reliever on our 40 man behind Perkins, Rogers, O'Rourke. Then add Palka.
Also DFA Centeno, he doesn't really offer much offensively or defensively. Then add Granite.
Finally DFA Molitor's favorite, Danny Santana. I do like his versatility but when looking at the long term he isn't anything more than a utility guy who hasn't improved after breaking on the scene his rookie year. Then add Vielma.
I think there is a decent chance all 3 player DFA'd go unclaimed and go to Rochester.
Any or all of Plouffe, Santiago, Kintzler could be non tendered to open up spots for free agents, and open up to an estimated $18+ million. To me that's enough payroll to sign a catcher, infield depth, and a reliever. If they sign another lefty reliever I could see a guy like O'Rourke being DFA'd to open another roster spot.