Everyone has their opinions on edge beveling, but here's some world cup recomendations.
Edge bevel tips for ski and snowboard
The only time you want a 0 degree base is during Slalom. AND in that situation, you want a severe side bevel to make your edge like 87 degrees instead of 90. This way it bites MORE during hard carves because you're pretty much always in it. Of course this wears out your edge more because it's "sharper", but you don't care because you're in it for the short race.