In reply to Denni:
In addition to being certified for skiing/snowboarding, being a good fit, and being comfortable for all day use, there are a couple of other things I'd check.
Firstly, the combination of helmet and goggles. Some just don't fit well together. I'd recommend you try them on together.
Secondly, if skiing in colder conditions the ear pads are well worth it, but I'd look for ones that still have small holes in the centre of the pads so you can hear people around you.
Lastly, if you're snowboarding, you're probably going to be wiping out more! A goggles clip on the back can be useful, one that secures the goggles completely with a popper rather one you just slide the strap behind.