While I'm happy with my roster so far, I am always open to offers and discussions regarding any of my players. While no one is "untouchable", it will take a lot to pry some away.
In particular, I would be open to trading Troy Murphy with additional considerations to strengthen my starting five of Parker, Afflalo, Granger, Hickson, and Dalembert.
UPDATE: Today's trade for Caron Butler upgrades my starting five, although I might prefer a more prototypical SG instead, so he could be made available.