There is no reason to upgrade to a new camera model because the mark IV is an improvement over the mark III (now both cameras), the 6D is an improvement over the Nikon D3s and the Nikon D700 is an improvement over the Nikon D200, and so on and so forth.
Canon PowerShot A480 camera, black
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Canon EOS 60D: 18MP CMOS Digital SLR Camera Body - Your Next Photography Companion
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Revamped Sony Alpha a6000 Mirrorless Digital Camera: 24.3MP SLR Camera with 3.0-Inch LCD and Power Zoom Lens
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Nikon COOLPIX L810 Digital Camera: 16.1MP, 26x Zoom, NIKKOR ED Glass Lens, 3-inch LCD (Blue)
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