Street is not an elite closer, but he'll pick up 25ish saves for a team. I have a ton of cap space to work with, so picking up Street's contract in 2014 and part of Posey's in 2015 will effectively cover Street's contract entirely.
Acquiring Dorssys Paulino is worth the $14M in salary, IMO. He is currently ranked by MLB as the #96 prospect, which gives him a value of $12.5M according to John Sickels' prospect values (http://www.draysbay.com/2011/12/29/2667952/what-would-it-take-to-trade-longoria). Paulino has had a so-so year, but he's still just 18 and he has plenty of time to live up to the very high projections.
Thayer and the two draft picks basically round out the rest of the deal.
C: Austin Hedges
1B: Prince Fielder
2B: Micah Johnson
2B: Alex Yarbrough
3B:
SS: Luis Sardinas
SS: Jose Peraza
SS: Dorssys Paulino
SS: Roman Quinn
OF: Jesse Winker
OF: Andrew Toles
OF: Phillip Ervin
SP: Tyler Glasnow
SP: Matt Wisler
SP: Zach Eflin
SP: Enny Romero
SP: Burch Smith
I get two valuable H and S guys from SDP. I give up Dorrsys, my only high ceiling guy left, but I feel that two years of Street (assuming he doesn't collapse on me) is worth much more than that. I think that the 7 Million on Posey's contract next year will free up some cap space and the loss of two draft picks up not that significant to me.