Hi Jman,
Your 18-55mm is also compatible with the Nikon D600 which whilst a Full frame camera, will also operate in DX mode by cropping the sensor and thereby not vignetting the image. The D600 or D610 would be excellent choices and exceed the performance of the D3100-3330 , D5XXX series and the Canon 6D. They would offer a 1-2 stop improvement in dynamic range and/or reduced noise at equivalent ISO sensitivity.
Best
JA
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