I very much appreciate all your help.
Just had the idea (wondering why I didn't have it before) of asking a professional snowboard photographer. Since many of them have a blog I'm sure I'll find a nice guy who shares some knowledge. As soon as I know more I'll post it here. Should spending more money be the only way to go - well, snow doesn't fall yet.
Forgotten to mention, JustinThyme is right, a lack of light won't be an issue for sure.