Try to get a protected first. I posted last week that we should try to get James Johnson thrown in, he wasn't playing too much. He's played great in his last 3 games - especially against the Spurs. Now I'm guessing they will keep him.
If the point is to not make the playoffs, get a better draft position, and save a couple bucks, then take back a future 2nd.
If the goal going forward is to start competing, don't make the trade unless you can get a protected first or Johnson.