SOJ all the way.
Ring scales incredibly with anything that increases your sheet damage. New gear, Gruesome Feast, Soul Harvest, Provoke the Pack, Pierce the Veil, leveling up, black weapons, frenzy shrine, etc...
Not to mention, increased max mana scales with Spirtual Attunement, reduction cost or damage % Increase on your primary damage ability, which increases your effective DPS.
You can gain EHP in every other slot, and I'd consider SOJ to be best in slot for a Witch Doctor.
Elites are what you have to worry about burning down, not trash. Elites are Blues, Yellows, Goblins, and Bosses.
My sheet DPS can skyrocket to 385k+ in my current spec, which is a touch over 500K damage vs elites wearing a Stone of Jordan.
Just my opinion! if you're concerned with how your sheet damage looks, or are low on EHP, roll with any of the above mentioned rings.
Edited by Saythe#1826 on 2/13/2013 11:25 AM PST