Everything should be Warforged or Halfling. And just an FYI, a Warforged is actually two halflings operating a tin machine that is why they are immune to fatigue because they also take shifts inside; They have double the levels so neg levels dont effect them because they are constantly hitting the restore on each other. Immune to poision because they are often heard inside squabbiling about who has the antidote, suffice to say, constant remedies are being belayed inside.
So in the end, Halfling FTW!