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I just picked up an EF 70-300 IS USM lightly used for a steal and have been very happy with it so far. Something to consider is that any $ you invest in EF-S lens' will be wasted if you ever upgrade to a full frame body. I personally dont like to buy any ef-s lens' for my one crop sensor body because they wont work with our 3 full frame's and I like to keep everything compatible with each other.
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