Both the Nikon 300s and Canon 7D are superb cameras and at the top of the crop factor (smaller than 35mm film size sensor) tree and will more than satisfy your needs for years to come but may be over kill for what you need unless the bug bites deep and even then it would probably be a case of want rather than need. The Nikon D90 and Canon 500D would be cheaper and are both good cameras and as you still have the Nikon lens have a good look at the D90. It is important to actually go to a shop and handle the cameras and have a bit of a play to see which one feels better in your hands. The other thing I would say is do not rush to buy every thing at once but start off with one general lens and become comfortable with that and learn more about photography including the technical side like the whys and whens of speed, apertures, ISO focal length etc and then you will know where to go next in the sense of the type of photography you enjoy and the equipment you want/need to pursue it.
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