sigma 50-500 OS with Nikon D7000

Hi! can anyone guide me how the combination would be. Need a lens for Bird Photograph and also cheap. Sigma 150 - 500 was also an option but then 50-500 you get more coverage and being new lens must be better. camera D7000

Source: DP NIKON D90 - D40 / D5000 FORUM visit source for complete content

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