If you're ever low enough on mana that you need to swap to a spirit staff to regen mana other than to innervate, you shouldn't be getting things like spirit on boots vs vitality. No, outside of innervating it is definitely not worth using the rod of blazing light over ethereum. Most people can't actually use the full mana regen of their innervate anyway, so swapping to a spirit staff at all doesn't help.
The shattered sun pendant is probably about even with the za haste neck. Random proc things have very little value for druids because the whole point of hots is to be stabilizing people, randomly doing it for more or less doesn't help. The only time +healing procs are good for anyone really is on direct healing and regrowth, our primary direct heal, gets very little out of the +healing proc. Its certainly not a bad neck, But its definitely not way better than
[Brooch of Nature's Mercy] and may not be better at all. That's going to be a judgment call based on your style of healing.
The random haste procs don't help you get a 5 cast cycle at all. They probably make it harder. Again, the whole style of druid healing is based around steady output and controlled bursts via sm/ns and that trinket doesn't help either of those. Using a combo of EOTM, LCPB, Battlemasters, Alchemy trinket, Memento, or if you're really short on mana in a particular fight, the bangle is the way to go.
Kings is good.