I currently own both. I was going to sell the D40X but since it seems like it is now worth much less than I paid, I'm thinking about just keeping it. At the end of Feb. I'm going on a 4 day trip to Georgia to watch motorcycle races. My plan is to just take both cameras. One rigged with my 18-55 and the other rigged with my 55-200. Also bring the 50mm with just because I can. So if that is the plan (why not, right?), does it matter which lens I put on which body? I expect I'll be using the 55-200 more because its outside and I'll probably being shooting from a distance. I figured I'd put this lens on the D80 and take the majority of my pics with this setup. Does this sound like the right plan? I could also just bring the D80 and switch lenses if needed, but why switch if I have 2 bodies available?