So, I'm going to be getting a new camera in the near future (about next spring or summer probably) and have a few questions so I don't waste my money

I've heard that the Nikon d50 and d70 have different colour cards than each other or something? Which one is better/would I want more?

Also, I was looking at the d80 and thinking maybe I'd just like to get that.. but would it really be a good buy?