Finding the right helmet is like finding the right boots, its just not quite as important from a skiing standpoint. Every head is shaped differently, and all helmets have different fits. Go to a ski shop and try a bunch on, you'll narrow down your options quickly on fit alone. Then you can address features like ventilation and goggle compatibility.
I have a medium-sized, narrow head (i.e. length from brow to back is quite a bit greater than width from ear to ear), and the Smith Variant fits my head like a glove, and I love the vents which can be opened or closed manually. I also wear Smith IO goggles with the Variant helmet, which work great as long as you get the $5 "Helmet Helper" adapter so the back clasp on the goggles doesnt interfere with the goggle lock on the back of the helmet.