Marchisio and Vidal for Juventus are great all round midfielders, Marchisio especially so as he is in the mold of Gerrard. However Vidal has just moved and Marchisio loves Juve
De Rossi, Gerrard, Sweinstager and Kroos are all rounders but none are going to leave their clubs
Despite being played as a cam Kevin Prince Boateng can do a bit of everything in the middle of the park, I can't see him moving though
Sahin can do a bit of everything but he has just moved too
Modric actually does contribute to the defense, just not as much as Parker or Sandro (as someone has said, typical CM partnership), he would cost too much though.
Fellani is a good shout, he isn't very creative though
Radja Nainggolan is probably the most realistic option, he had a pretty good half a season with Caligari and can do a bit of everything