Hello all. I have owned and used three "point & shoot" digital cameras in the past several years and I finally feel I'm growing out of the limited ability and functions of P&S cameras. I take very many photos of our dog inside the house at night under a poor light condition, and also outside at the field at sunset when the dog runs around fast. Dogs make unpredictable quick moves, and I can not predict when & how the moment of good photo shoot arrives. I currently use a P&S Canon SD1000, which is a compact convenient camera to carry around, but it does not only produce subpar photos of the dog under a poor lighting in the evening, but it also often misses the very chance of taking photo since the SD1000 takes more than few seconds to be shoot-ready after I power up the camera. When the moment comes, I turned on the SD1000, but often the shooting chance is gone. This leads me to the idea of getting my first SLR camera specifically to capture the image of unexpectedly fast moving dogs at sunset, or under a poor lighting condition inside the house at night. As I explore the option, Nikon D300 seems to be candidate for my purpose, and I am ready to pay $2500 if it's recommended. However I also heard the Nikon D40 is a great camera, but I worry if a D40 can handle rapidly moving dogs in poor lighting. One thing I want to avoid is to repurchase or upgrade the first DLR very soon after my first purchase, given that I am willing to pay $2500 for a D300 if it has clear advantages over D40 for my particular applications. I am planning to match the camera with a Nikkor 18-200 mm DX VR lens primarily for convenience since I prefer not to swap lenses often. Would you recommend a Nikon D40 or D300 for me (to use with Nikkor 18-200 mm DX VR lens)? I would greatly appreciate your opinions from seasoned photographers in this forum. Thank you very much for your input.