Well, lets start with the Heat
I think they need a center. Bosh was overwhelmed by Hibbert. Not to imagine what a healthy D12 or Bynum might do to them. I think Bosh is expendable, and Riley is looking to upgrade the PF/C position.
Spurs are also looking for an upgrade to Splitter, maybe J-Smoove? And they need a Manu replacement. Some young legs at the 2. Maybe Wilson Chandler?
Though Chandler could also be an option for the Pacers. Tony Allen is a FA who could draw interest from Indiana.