I've seen some pretty awesome photos come off of the Canon G series. G10, 11, & 12. I believe the G10 has an optical view finder which I find to be key for any camera you are going to use to shoot snowboarding.
For a DSLR, I just got an entry level model. The Nikon D5100. So far I am impressed with the image quality. The sensor is great, as mentioned by poutanen. It's the same as the D7000. The frames per second are just over 4. Fast enough to get tons of quality shots. The HD video is alright, but it could be better. I found a two lens kit with the body for $700. That is with the 18-55 lens and the 55-200. They are factory refurbished, but I also got a 1 year extended warranty with the purchase. Hard deal to beat.