My index was a combination of my work on the Top 5 each year, career win shares, MVP share, Basketball-reference's Hall of Fame odds (to include championships), and BBR's Elo player ratings. I altered things a little bit to help some defensive studs out, but pretty much stuck to the results.
There were two big names who maybe should be on the list. Arvydas Sabonis never got a chance to show the world what he could do in his prime, but some suspect he could've been the best center ever. Also, I left Tim Duncan out, even though he's really more a center (I'd probably put him right behind Shaq).
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10. Dwight Howard (5 points in the index)
He proved himself the second best player in the NBA, and with it moved himself into the top 10, knocking Bill Walton (or Willis Reed) out. He and Ewing were the only centers under consideration who haven't won a championship, and everybody else besides Malone has won at least two. Howard's entering his prime, and his time will come.
9. George Mikan (7 points)
Mikan is without a doubt the hardest player to rank on this list. He played in a completely different era, and probably would play something like Aaron Gray if he were in the league now. At the same time, he was the NBA's first superstar, and the center piece of the leagues first dynasty.
8. Patrick Ewing (9 points)
He will always be known for failing to break through (or for his Snickers commercials) but he took the Knicks to the finals twice, and led a renaissance of New York basketball. It's just tough to go up against MJ in your prime.
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7. Moses Malone (25 points)
Moses Malone is often a forgotten name among centers, quickly replaced by Olajuwon in Houston and never living on Dr. J's level in Philly. He peaked in a way that few players ever have. According to my top 5 calculations, Moses was the best player in the NBA in 1978-79, 81-82, and 82-83.
6. David Robinson (28 points)
Robinson was a physical specimen, and is being appreciated even more with advanced statistics. He consistently shows up at the top of Career PER or win shares lists, and can be seen by some methods as one of the best players of all time. He needed Duncan for playoff success though, and in his prime got it taken to him by the next man on this list.
5. Hakeem Olajuwon (24 points)
While his regular season stats aren't quite on par with Robinson or even Malone, taking both of the titles during MJ's break earned him a top 5 spot among greatest centers ever. He beat both Patrick Ewing and Shaq in those finals, and the way he dominated NBA MVP David Robinson forced me to give him a bump up this list.
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4. Shaquille O'Neal (38 points)
Shaq was the best player in the NBA in the immediate post Jordan era, ruling over the league in 1999-00 in a way that few ever have. He could rule games physically, but also had great touch around the hoop. He never quite got all he could out of his basketball potential, but winning 4 rings and being an absolute force for 3 different teams still put him 4th on the list.
3. Bill Russell (37 points)
Russell helped integrate the sport, anchored the greatest dynasty in the history of athletics, and my be the best defensive basketball player ever. A player with 11 championships will never be seen again in any high level team sport.
2. Wilt Chamberlain (44 points)
He occasionally cared more about women or statistics than about winning, but he also once averaged 50 points and 27 rebounds per game, over an entire season. Nobody has had a game like that since him, and that what he used to average! Wilt the Stilt also managed to squeeze in a couple chips around Russell's hogging.
1. Kareem Abdul-Jabbar (46 points)
Kareem was the best player in the NBA for 7 total years, and was the best player in the league for 4 straight seasons from 1970-74, a streak matched only by Michael Jordan and now Lebron James (didn't see that one coming huh?). The NBA's all-time points leader is also the greatest center of all time. For now.