Either the Sigma 120-400 OS or the 150-500 OS, a second hand Canon 100-400 L or the 400 f5.6L or the Sigma 50-500 OS if you can find a second hand one. I've not used the 400 f5.6 but I've used the rest and I've stuck with the 150-500 OS while the wife has the 120-400 OS. All will give you great IQ and all will be within your budget, and with the 120-400 and 150-500 you should get new ones for your budget if you look around.
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