I'm not much into big signings. The Angels "won" the offseason before 2012, signing the best SP and position player on the market, and didn't make the playoffs. They signed Hammy and didn't make the playoffs in 2013. The offseason before the 2009 season, Arte couldn't sign Teixeira, so made "smaller" signings - Rivera, Fuentes, Abreu, gave Morales a chance - and won 97 games and advanced to the ALCS.
Arte made no big signings last year too, and despite the Joyce failure and Hamilton debacle, the Angels were in postseason contention until the final game of the regular season.