A record to SD with view finder and image stabilization I find to be very important. Get a dedicated camcorder and skip the DSLR if your primary thing is video for Movement analysis.
I use a Sony HDR-CX550V. It has 64Gb of internal storage and can handle a 64g sd card as well. Battery life is good. stabilization is good. If you get an extra Tele lens you can stand at the bottom of the race course and still get good video from a long way's away.
For good control and framing of skiers a viewfinder is a must in bright sun.
This video has NO post processing other than being trimmed to remove me turning the camera to view the next skier and used the youtube "image stabilization and auto color contrast" but the framing and zooming was all done real time.
If I had to replace my current Sony, I'd probably be looking at the PJ650V or the even newer FDR-AX series camcorders. All have view finders and output to HDMI (great for plugging into flat panels in the bar or at the house), Sony's award winning image stabilization and manual focus ability (with a focus ring not touch screen) which comes in very handy on those real foggy or snowy days where the autofocus is useless.