Based on how they'd improve the club:
Patrick Willis, MLB/WLB, San Fransisco. He would immediately step in as the best 4-3 outside linebacker in the NFL or you could put Laurinaitis on the outside and Willis in the middle. Either way, you now have the two best linebackers in the NFC West on your team.
Larry Fitzgerald, WR, Arizona. No offense to any of our other receivers, but adding Fitz would bring immediate credibility, leadership, and skill to our wide receiving core. He'd make defenses respect the pass in order to help Steven Jackson. He'd help out Bradford with his instincts, and he'd teach our young wide receivers what it truly means to be a superstar.
Mike Iupati, LG, San Fransisco. Our offensive line is now complete. Iupati runs over everyone who dares to stands in his way, and he's nimble enough to stop the best interior pass-rushers. He helps out Rodger Saffold with the run. He can pull, get to the second level, and make room for Jackson and Pead to run. Oh, and he also protects Bradford.
Others I considered: Justin Smith (DE), Aldon Smith (DE/OLB), Kendall Hunter (RB, San Fransisco), Chris Culliver (CB), Joe Staley (LT), Brandon Mebane (DT), Bobby Wagner (OLB), K.J. Wright (OLB), Richard Sherman (CB), Earl Thomas (FS), Bobby Massie (OT), Calais Campbell (DE/DT), Darnell Dockett (DE/DT), Patrick Peterson (CB), Michael Floyd (WR), Daryl Washington (OLB/MLB), and Sam Acho (OLB/DE).