So Larry - here is 2 cents. I went to my local camera store yesterday. I compared a 750 to a 7100 (assumes 7200 will be same in size/weight as 7100) side by side with identical lenses. 750 was noticeably heavier to hold in my hand. Also we discussed file size relating to my current computer. 750 has way bigger files and 7200 will have smaller files. Bigger files mean more real estate consumed on my hard drive etc. I have to have one camera or the other because most of my lenses are "D" which means I need the motor in the camera for AF function. In exact same lighting, AF function was faster in the 750 than the 7100. I was told the 7200 will have same focus, processor and some other things and so it "should be" just as fast as the 750. The biggest DIFFERENCE between the 750 and the 7200 is supposed to be the SIZE of the pixel. Hence, greater or superior low light performance. I really liked the light weight package in the 7100 and both cameras will offer the low light sensitivity that I want. I am really leaning to the 7200 because I think it will meet MY needs and save a bunch of $$$. Gentle photo enthusiasts: I hope my logic is sound and my facts are correct.

I had to go through a process of justifying the expenditure when I bought my D5200. I would have loved to go FF or even just opt for a D7100, but for a relatively modest outlay I got a very reasonable camera and lens. (If you can believe some sources, there's not a huge amount of difference between the image quality of a D5200 and more expensive alternatives. I've never done a side-by-side comparison, so I can't comment).

Coming to the point, if you were a professional photographer you would be justified in opting for the D750 or some other expensive alternative, but you're an amateur, and the main judge of your work will be yourself. As an alternative to having to have the best, you could just learn to not be too obsessive about image quality. A D7200 will NOT give you bad results, so perhaps the best answer is to learn to develop a sensible level of tolerance towards owning something that isn't the best of the best.

Going by the reports, the D750 has exceptional low light performance, but then again the D7200 is being touted as being good in that department as well. It sounds like you're comparing a good camera with one of the best, so there's no reason why the D7200 should come out of that comparison looking bad.

It's your money, but somewhere in the back of your mind you'll have to justify the significant expense of going FF - if that's what you choose. I've learned to be happy with the less-than-perfect (but still very good) performance of my D5200, with its impressive dynamic range and perfectly adequate functionality.

I was in a similar situation this Christmas. I got my Dad a D7100 as a present. Later I bought a D750 for myself, coming from a D5000. The ISO alone makes the choice between a 7100 and a 750 clear. I do not know how good the ISO will be on the 7200 but I can tell you this. The low light shooting on the D750 will blow your mind. And, as stated before, your lenses will still work with the D750. Your wide angle lens will actually work properly with the full framer. If money is not an issue definitely take the D750.

I too am a hobbyist with photo interests like you. I have been struggling with the same idea as you going from DX to FX and here is where I'm at. I really like the speed in which the camera bodies are changing, almost daily. I picked Nikon when I first starting getting back into photography a few years ago. I liked the DF when it came out but I also shoot video, the D810 is a great camera but I don't need 36mp & I'm not keen on the size & weight of the body either, when the D750 came out I thought I would really like that body until I learned it has a low pass filter.

My decision is that I would start investing in "quality glass", my first purchase over the holiday's was a 24-70 f2.8, the photo's I've taken with that piece of glass on my D7100 has blown me away! The difference is night & day to me. Right now I'm perfectly happy with my camera body & will continue to add the 70-200 f2.8 (I'm waiting for the brown truck). I will probably move to an FX body but right now the glass has me really excited & content with my D7100.

You can't go wrong getting a newer body, but you need the glass to go with it.