i have normal Scott goggles ($30-$40), run of the mill nothing special with the amber lens, they work absolutely fine and only fog up when I wear them up on my head (?) I guess because my head gets pretty warm. But honestly for a beginner they work really well. I didn't need anything special yet and I can't imagine buying a pair of goggles that cost almost as much as my bindings...it just doesn't seem right. But I don't know what is better about the expensive ones-Anon, Spy, Oakley so I really don't know.
I also wore a pair of dollar store sunglasses for a year and thought they were great until someone gave me a pair of Spy's for my birthday lol. If I buy expensive ones I'll prob still stick with Spy, I love the sunglasses and their goggles seem to be a little more reasonably priced.