Shutterfly,
As you have indicated that the biggest lens you have is 300mm (at full zoom) I would suggest that you would be far better off saving your money until you can buy a bigger and/or better quality lens. This will get you better results than a body that just happens to have a high fps. Your D50 does 2.5 fps, this is quite enough to be getting on with and is highly unlikely to be the thing that is limiting your photography.
Hope this helps.
Duncan
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