建議泥坑D3200，新機身，24m傳感器，至少近年不會過時

24.2 effective megapixels. Nikon-developed DX-format CMOS image sensor [NEW] Featuring 24.2 effective megapixels, the D3200's large image sensor faithfully reproduces the texture and brightness of subjects. It is also possible to emphasize subjects by beautifully blurring the background. With the high pixel count of 24.2 megapixels, satisfactory resolution can be achieved even when trimmed images are printed.

詳細介紹：

http://imaging.nikon.com/lineup/dslr/d3200/index.htm