Wilt's the only center to lead the league in assists, so you've got to include him in there somewhere. But I never saw him play so I don't know how much of that was system-related. Shaq deserves an honorable mention too. The best I ever saw was Sabonis.
Edit: Check out Brick's postcount - I love that the system does that 
for what it is worth. chamberlin was without doubt the greatest center so far in history. i love russell, but chamberlain was more dominant in more areas.
chamerlain led the league in scoring seven consecutive seasons (1959–65), was the leader in field goal percentage 9 times, the top rebounder 11 times.
he scored 100 points in one game and averaged 50.4 points a game one season. i believe no TWO players on a team have passed 100.
rebounds? he had 55 in one game. he decided he would show everyone he could rebound, and he averaged 27.2 in his best season.
some pretty prrty people then accused him of only thinking of himself. so he decided to show everyone he could also provide assists, leading the league in 1968.
by the way, he showed his versatility by scoring 22 points, grabbing 25 rebounds, and dropping 21 assists in a game in 1968.
so, best passing center? when chamberlain wanted to pass he could do it.