What you going to main, or at least start Legion with?

edit to title : What are*

Personally I'm probably going demon hunter, but have no idea what spec. I like vengeance (haven't tanked with it though) as I can go up in tanaan and take on 4-5 of the 1.4mil hp demons at the same time and live. Just so fun. Havoc has mobility but seems awfully squishy to me, but I know the talents(skills) will most likely round it out. If any of you know for a fact that havoc is okay at the get go let me know, I'll go that then as I don't really don't want to die trying to kill simple mobs, but I'd also like to see any elite and be like 'cakewalk'

From what I've seen in EU streams, prot wars are doing good leveling.