You should definitely buy impact shorts. It's probably the most useful protection in snowboarding, because it's warm to sit on snow or whatever with it.
Not sure, if I could surf internet now, if I would'nt wear one while crashing a big jump... I took way too much speed, flew over the sweet spot and landed on flat area from about 5 meters (~15 feet) hight. My legs could'nt absorb such impact, so I hit really hard snow with my poor butt. Fractured 7, 8 and 12th thoracic vertebrae. Doc says i'm lucky, because it's small compression fractures and usualy it takes half of the year to fully recover. So, I hope to be able to snowboard next season.
Shorts, that I used: Powerslide Crashpad-Hose Pro kaufen bei der-rollenshop.de
Not bad shorts, but now I would like to upgrade for better if it is possible. I have a lot of time to decide, what to buy. So, all your suggestions are welcome!