I have my Eastern rankings like this:
1. Pacers
2. Bulls
3. Wizards
4. Cavs
5. Hawks
6. Raptors
7. Heat
8. Nets
9. Celtics
10. Hornets
11. Knicks
12. Pistons
13. Bucks
14. Magic
15. Sixers
I imagine your assumption for the Pacers includes that they retain Lance Stephenson? Personally it looks doubtful right now. And honestly, I think they're going to have an underwhelming season next year.
Hawks and Hornets in particular still have plenty of cap room to make an impact signing, so I can see them jumping higher easily.
These are my current rankings:
1. Bulls
2. Cavs
3. Wizards
4. Heat
5. Hawks (Still have room to improve roster)
6. Pacers (Depends on Stephenson, could go make a jump, but I think they'll under-perform)
7. Celtics (Much better roster balance so far, and healthier, underrated talent)
8. Nets (May be underestimating them, but I don't trust them.)
9. Hornets (Still have room to make, but roster too unbalanced and incomplete right now)
10. Raptors
Didn't pay to much attention to the ones below, so left them as is.
11. Knicks
12. Pistons (This one is a big x-factor to me, very hard to gauge because of chemistry issues)
13. Bucks
14. Magic
15. Sixers