I see the East like this for talent in 4 tiers but I don't think that one team can really run away with it. Some teams have great starting 5's but weaker benches, some teams have talent spread throughout but not as much heavy firepower. So here is what I see if the season started today.
Tier 1: Magic, Nets, Pistons, Knicks
Tier 2: 76ers, Raptors, Hawks, Bobcats
Tier 3: Bucks, Wizards, Cavs, Bulls
Tier 4: Pacers, Heat, Celtics.
But it was kind of hard to judge since players show up on multiple rosters. Some teams need to update the roster thread. Then the my tiers might change.