It's void elf all the way for me, except for the classes they can't pick, so I guess i will be keeping my NElf Druid, DH, DK and Draenei shaman - but might change that to Dark Iron if they are available as shaman - it's possible they will be, wielding the elements is quite a dark iron thing - but not in the peaceful nature loving way, more in the angry fire god ragnoros way. Don't really care about nightborne that much anymore, suffice it to say, they didn't improve on the faces though I was a big fan of the culture it hardly seems important now, and you wonder why you ever cared that much.
Void elf all the way.