Lions and Eels are both very hardy, I would get a small Lion as your first fish in (big established Lion might be dangerous to smaller additions to come later
). Eel can go in early. I would do a Tang about 3 months in, and wait till the tank is 6 months for the Angel as they need a more established tank with flourishing live rock. I don't know much about the Rabbitfish you listed, but they are moderately hardy fish in most cases, so whenever after the Lion and Eel.....That's how I would do it based on your list.
Oh, and since I didn't like your puffer idea, perhaps a second Tang would be a good choice, or a Harlequin Tusk