To the OP, if you search for some other threads on this topic I've given a much more complete description elsewhere. Both systems are as good as each other, but different. Nikon is better in some areas, and Canon is better in others. It's pretty difficult to know which system would suit you better unless you already have an established shooting style and know what you like to shoot for the most part. Canon does have a much more complete and less expensive telephoto lineup if you think you'll be doing a lot of sports. Nikon seems to have a better and more complete consumer lens lineup. Their bodies are more automated and suit photojournalist style photography better. Their wide angle lenses are quite nice too. Canon lenses tend to be cheaper, but there's more used vintage Nikon glass floating around out there that you can use with Nikon that's dirt cheap. Canon lenses on the EF mount don't go back as far since they changed their mount design with the advent of AF.
I have and like Nikon. I've seriously considered switching to Canon twice, but stuck with Nikon only because I felt what I'd gain with Canon wouldn't significantly outweight what I'd lose from Nikon enough to bother switching. I like both systems.