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"RE: Need advice on camera purchase"
If you plan on wildlife pics during your upcoming trip then I reckon you would benefit most from a longer lens. The 300 f4, both with and without 1.4 converter is regarded by many to be very good.If you buy an FX camera the 70-200 will probably not be long enough for small to mid sized wildlife. the D800 will give similar resolution to your D7000 when used in DX crop mode but I know I would want a longer lens than 70-200, even on a DX body.
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