DeMarcus Cousins is very good and has the capacity to become one of the best in the league as he improves his decision making.
Varejao has turned himself into a very good passing big man over the years. Nick Collison is another strong passer. Marcus Camby is a very good to excellent high post passer.
Chuck Hayes is pretty good too. Chris Bosh is a good all-round but unexceptional passer. David West is good too. Although I wouldn't be any of them up with the best of the best but definitely above average and quality passers.
Has anyone mentioned David Lee? He is very good passing PF and an excellent one at the center position. And of course, Lamar Odom. He can't score anymore but he is still a very good passer.
Carlos Boozer is a very good passer. Under-utilized in Chicago due to Joakim Noah's brilliance but Boozer was a joy to watch in Utah.