I think Bosh's destination has a lot to do with who does well in the draft and where Lebron and Wade go/stay.
If Wade stays in Miami, I'd say that's Bosh's likely destination. Get them to sign a decent PG, keep Beasley at SF, O'neal at Center. That's a good starting unit.
If Lebron goes to NJ or Knicks, Bosh would probably take that as his second choice. I figure that's the backup plan because Miami has players that are a little more established.