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How much of an advantage would I gain, if any, if I COULD find an amazing deal on a D90?
For me the advantage would be the LCD screen on the top of the camera which shows you most of your settings, as well as the number of buttons to enable quick modification of things. With the lower end cameras more things are done on the main screen with menus and sub menus. The fact you have the option to use auto focus with older lenses could be an advantage as you have access to a much broader range of lenses. You also get a better viewfinder (see more of what you are shooting and it is brighter)
With the D90 you don't have the latest sensor, processor, AF system, or articulated screen and the video shooting is relatively basic other than that I think it does the job for most occasions.
I have had my D90 since 2009 and still find it a great camera to use, not outgrown it or thought I need to replace it. The fact Nikon have not removed it from the range also tells you how the balance of features seem to work for a lot of people.
If you can find a camera store where you can try the models on your shortlist then this is a good way to see how easy it easy to navigate controls and settings menus. As well as feeling the camera in YOUR hands (we are all different in this respect). Maybe even find a hire company who will let you try before you buy, some refund the hire cost if you purchase the kit.
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Nikon D90
Nikkor AF-S DX; 18-105 f/3.5-5.6G VR, 55-300 f/4.5-5.6G VR, 35mm f/1.8G
Speedlight SB-700
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