Based upon what you shoot, I would recommend the D7200. It's cheaper; the crop factor provides inherently greater reach. If you are cropping the 70-200 on a D7000, then you should consider adding a 1.4x teleconverter to the 70-200. You will still get good results from the D7200.

On the other hand, if you want better image quality and better low light performance, then the D750 is the better choice. But it's going to cost. DX lenses will be fine for the D7200, but if you need fast lenses you will need FX and they are better suited to the D750. The cost of FX is at least twice that of DX (cameras and lenses).

If you do want to go FX, you can easily use the 1.7x or 2.0x teleconverter with the 70-200 lens and get results as good or better than the D7200 with 1.4x TC. I've not been pleased using these TCs on my D7100; I prefer using the D750 and cropping if I need to.

Hi Tomglass,

I don't know if it has the AF fine tune ability or not. I am still learning all the in's and out's of the camera. I have had the camera since last August and love what it does so far. Where would I look to find that out? I still have the manual, plus two other books to learn how to use it. One of the books is a "Dummy" book. Those books are pretty good at explaining things. If I fine tune for the Tamron, would that mess up the AF for any other lenses, such as the two kit lenses? I constantly am using the camera for projects, so I don't want to try something and have it mess up something else. Any advice would be appreciated. I like the Tamron for its versatility in not having to change lenses, but am not willing to sacrifice image quality, and will stick with the kit lenses. I just don't understand how on my daughter's camera, she doesn't have a problem, but on my camera, it's more of a hit and miss as to if the shots are soft or not. The kit lenses work fine and so does the 1.8 lens. I especially like the 1.8, just wish it zoomed. And it bothers me too, that as much as the lens cost, that there is any kind of problem at all. If I can't figure out how to AF fine tune the lens, if there is one on the camera, where could I go to have it done? Would it be expensive to have it done?