looking for upgrade



I have had a Nikon D3200 for about 16 months. I have added a Sigma zoom lens, Tokina wide angle, and macro tubes, among others. I am developing skill with each quite nicely. Now I have been considering an upgrade camera body. I have made a significant investment in my lenses, so it is important that I remain with a line if cameras fully compatible with them. What would you suggest?
Switch to Nikkor lenses for Nikon bodies. Gradually changeover to Nikkor lenses.

The D3200 is a good body; stay with it until you have Nikkor lenses. After that consider adding a new body to suit your needs.