I'd second a sigma 70-200 f2.8. Really nice lens - good handling, quick focussing, good sharpness and contrast even wide open. When I'm not photographing birds, it's the lens that stays on my camera the most. It's also quite rugged - when Sheffield and Barnsley suffered the flooding back in the 'summer' I spent all day out in the steady downpour taking photos, sometimes with a binbag over the camera but often not; no problems and very little condensation at the end of the day.
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