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Just a couple of points to add to TommoR's post.
Firstly the a300 that he has doesn't have the "quick AF" live view system that is available on the newer models. The live view AF on the a300 works the same as it does on the Nikon D5000 so you can't draw a comparison there.
With regards to old lenses, Nikon have the largest back catalogue of compatible optics of any company. Having said that not all old lenses will work on a digital camera, and this is true of all manufacturers.
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