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to explain a little there are advantages to a crop camera 1.6 times on a zoom so a 70-200 would be 112-320.
this is for all lenses.
looking at what you have now and thinking budget i would look at sigma 17-70os great kit replacement its a good all round lens. and a lot cheaper than the canon 15-85. your 75-300 you need to look at what reach you need then look at say a 70-300L this is pricey.
go to shop and take your camera see what they are like
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