I think you underrate the west. The Clippers will probably just miss the play-offs. They're an 8th seed at best... I hope 
Hornets made the playoffs last year with a worse starting SF and PF, and arguably a worse starting SG, too. Plus, it's not like Okafor is that much better than Deandre Jordan.
Keep in mind also that Chris Paul was working his way back from an injury last year, so he wasn't performing at his top level throughout the regular season. It's possible that he might not get back to that level, but if he does, he could propel the Clippers even further than we might imagine.
In any case, the Clippers' roster should be good for the equivalent of 50-55 wins.
I expect the equivalent of around 50 wins from the Celtics, perhaps a bit less if they deal with injuries for a significant stretch.