1 open roster spot - which FA to pickup?

tackle heavy league

current roster:

lb-d'qwell jackson
lb-bruce carter
lb-brian urlacher
db-roman harper
db-kam chancellor

bench-colin mccarthy

i actually have one open roster spot - which FA would benefit me the most for the rest of the season?

FA:
lb-dj williams
lb-thomas davis
db-reshad jones
db-danieal manning
db-quintin mikell
db-stevie brown
db-george wilson
db-charles godfrey
db-glover quinn
db-aqib talib

thanks

I think Thomas Davis. He's close to being an every down linebacker now and should be a solid LB3+.