Quoting Legendary Bonnie Beaver:" With the Nikon you'll need to buy more expensive lenses because that Nikon doesn't have an autofocus motor in it so you have to have a lens with one in it. So I'd go Canon."
Something I wish I knew before buying my D40 back in 09'. Also I say go to best buy or target (if your target has electronics on display) and pick up both a nikon and canon. They feel very different imo. The whole lens thing and the way the canon felt in my hands made me choose Canon. I do not regret my decision.