Certainly do not buy the Canon 75-300 IS which is the 70-300 IS's predecessor and is not very good at all (soft). The 70-200 L lenses have a very high reputation, the best compromise being the 70-200 f4 IS version as the f2.8 is large and heavy in comparison. Not as long a focal length as the 70-300 of course but you could always put a 1.4 converter on one when funds permit. Me? I have the 70-300 DO IS and although it is controversial I love it.
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