Its a fair trade: Tristain Thompson is averaging a double double now while shooting over 500 from the floor but he's not really a shot blocker and shoots 700 from the line.
Check to see if Tiago Splitter is available, he's also been producing near a double double and won't cost you Evan Turner. He's inconsistent in his boards but shoots near 800 from the line.
Drummond might be the way to go, he's seeing more play time, averages the same as Splitter for Pts and boards, but shoots 700 from the field and blocks near 2 shots a game. He only shoots 500 from the line tho.