Hi Chris
If he kit lens is the 18-70 then you have your Town Landscapes and Family covered with that one.
Two of the ones you mention as possibles are around your budjet, but the 70-200 is way over. I have used the 70-300 f4.5G and it's a good tool but I needed the speed and went for a 300 prime. The 28-200 is an f3.5 and is a fast lens for the price. Take your D50 with you to your local dealer and ask for a demo useing your camera, take a few pics and see which one suits.
Good Luck with your choice.
Brian
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