I'd turn my attention to Denver and Portland, where each team has a log-jam at SF/PF.
Denver has Wilson Chandler and Danilo Gallinari. Both good offensive players, although I'd argue Wilson fits our style better. Wilson also provides better defense than Danilo. The one thing Galinari provides is ISO scoring which can be extremly helpful in playoff basketball when shots are tough to come by. Either guy would make the Cavs significantly better.
Portland has Al-farouq Aminu and Maurice Harkless. Both defensive minded guys who would help our perimeter defense tremendously. Both guys can get out and run, but neither are great shooters. The athleticism you'd be able to add next to LeBron and also have guys who can give LeBron a few minutes on bench would be huge. Harkless and Aminu are both good enough defenders to also take a lot of that load off LeBron against Golden State. Portland has really struggled this year, and part of that may be spacing. They really like Jake Layman and have tried at times to find him spot minutes. Moving one of Harkless or Aminu accomplishes that.
It's unfortunate Pat Riley is out of play, because James Johnson has had a huge resurgence. He'd be a great addition the way he has been playing.
Obviously PJ Tucker is in play.
With Gay's injury, I wonder if Sacramento starts unloading.....Omri Casspi would be an interesting addition.
