3. P.J. Washington
Regardless of the rumors saying that the Dallas Mavericks haven't pursued P.J. Washington, they absolutely should.
Washington is the best available free agent by a landslide, and the Mavericks should make a move for him sooner rather than later. He is a restricted free agent, meaning that if he signed an offer sheet elsewhere, Charlotte would likely match. But that doesn't mean Dallas can't get involved.
If Washington signs his qualifying offer, he would become an unrestricted free agent next summer, and the Hornets could lose him for nothing. If they think this will happen, they could look to ship him off with a sign and trade. Obviously Washington would have to agree to terms with the team, but Dallas could be an attractive destination for him.
He grew up in DFW and would likely get the chance to play in the playoffs for the first time in his career if he came to Dallas. The Mavs could throw a package of Tim Hardaway Jr. and a second-round pick to the Hornets for Washington. They could even form a different deal that includes Maxi Kleber if they wanted to. This would be a big sacrifice since it is just a sign and trade, but the Mavs should be aggressive and grab this young, win-now piece.
He typically plays power forward, just like newly-signed Grant Williams, but the Mavericks could find a way to make this work. Washington is too talented to pass up on and would give the Mavs another two-way player in their frontcourt.