Eric Williams can't be traded until August 21st. Neither can Matt Bonner.
If the team doesn't use recently acquired players, the Spurs would have to trade:
Brent Barry + Michael Finley (or Robert Horry) + Beno Udrih. I believe if Horry is used instead of Finley, Udrih is not needed (I would rather have Udrih, though).
Anyway, those are some of the deals that work under the cap.
And Chandler is most likely going to New Orleans for PJ Brown.