Those are all fine cameras, but do yourself a favour. Check out the Pentax line. The K200D is one of the highest rated. It's completely weather and dust proof. The image stabilization is in the body, so you don't have to keep purchasing the technology over again with each lens you purchase, like in the Nikon or the Canon. The added bonus is that the lenses are much, much cheaper to produce and they are smaller and lighter. You don't get any of that with C or N.
Generally, you will get more value and a great camera for much less than the others because they don't spend multi millions of dollars on advertising. The downside is nobody knows about the product.
