Ok, this might raise a few eyebrows but have you considered picking up a second-hand Nikon D70? Before I get jumped on by the folks thinking I'm just a fanboy D70 owner, I'm not. I actually shoot with a Canon 40D and I really like. I've gotta admit though, that I'm starting to throw a few envious glances the way of the Nikon boys.
Are you looking for a first DSLR? If you are, I really think the D70 could be an awesome choice. The main things that are likely to put you off are that it's only 6MP and 3fps. With regard to the resolution, it really doesn't matter. I know you hear a lot of people say it but don't get caught up in the megapixel race! A 6MP DSLR is waaaay different to a 6MP compact. There's no getting around the fact that 3fps isn't too fast. Again though, I don't think this is a bad thing for a first DSLR as it'll teach you to be way better at anticipating the shot and that's an important skill. My 40D fires at 6.5fps but there really aren't many shots that I've got with this that I don't think I could have got with careful use of my old 350D (rebel XT).
Right, now the main reason that I've suggested the D70 over other second hand DSLRs is something that's easy to overlook and may or may not be important to you. This is going to take a bit of explaining so bere with me.
A hell of a lot of the ski photos you see with real edgey wow factor are shot with flash (either on camera or off camera) where the rider seems bright and the ambient light seems kinda darkened down (see Dan Carr's website and you'll see what I mean). The D70 is (as far as I know) the last camera that had a native flash sync speed of 1/500th of a second meaning you can use flash with any shutter speed slower than 1/500th. Virtually all cameras since then have been 1/250th. This is really important for balancing flash with ambient light as it means that you can use the same flashgun to balance a day that's twice as bright. It also means you're way less likely to get motion blur on your flash shots. For a proper explanation of what I mean, check out this link:
http://www.kenrockwell.com/tech/syncspeed.htm
This is pretty complicated stuff so, if this is your first DSLR, you'll probably be thinking I'm a nutter but I guarantee, If you like your sports photography, you'd be grateful for it in time. Also, for the saving you got by buying a second hand D70 over say, a 40D, you could pick up a couple of Vivitar 285HV flashes (about $90 a pop) and cheap Chinese ebay wireless triggers and be ready to start submitting to mags!
As I said, I shoot a 40D and I do really like it. However, I think the D70 would be able to do 95% of what the 40D does at a fraction of the cost and I'd happily pay EXTRA money for that 1/500th sync speed.
Anyway, in general, I'd look more at the whole brand that you end up buying into, whether it be Canon or Nikon or whoever else, rather than just the one model you decide to get as, once you've got you're camera and lenses, it's pretty hard to switch over. In my case, the D3 has really got me liking the look of Nikon at the moment.
Damn thats a big post! Sorry for hogging page space! Hope it helps you out.
Ross