I prefer the 400D over the 30D. The dust-reduction system is one of the main reasons. Also, for riding and skiing, I like the smaller 400D body. However, if you think you need the 5 FPS speed of the 30D, then it might be the better choice. Most of the rest of 30D features aren't that valuable to me. It's only the speed that I care about. And I lived without it for the past year. I shot Sea Otter, Downieville, and lots of other mountain bike stuff with my 400D and it worked just fine. I think buying the 400D and spending your money on better optics and then concentrating on your technique until the camera is a problem is the best strategy.Originally Posted by agtaylor