I had my friends D7100 and my D750 in my hand. The difference was minimal for shooting. Yes you get full HD video and full Frame and tweaking inside camera but are you willing to part with the $$. I went from D90 to D750 only because I wanted to go full frame and I needed an enough upgrade to justify buying a new system. D7200 is $700 cheaper than the D750. You can find a D750 used for around $1200 which is a good price.
Oh the D750 is worth it. If that what you want. The D7200/D7100 are just as good, just not full frame. I think the D7200 and D750 both shoot Full HD. Thats not a selling point for me because I don't shoot a lot of video. What I've seen so far is that the video quality in Nikon cameras have improved since introduced in the D90. Saving $500-700 if you go with DX camera. The D7500 is the newest in that group. It pretty close to the others. One difference I see is that the D7500 has only one card slot oh and faster shutter speed.
D750 vs D7100
http://cameradecision.com/compare/Nikon-D750-vs-Nikon-D7100
D750 vs D7200
http://cameradecision.com/compare/Nikon-D750-vs-Nikon-D7200
D750 vs D7500
http://cameradecision.com/compare/Nikon-D750-vs-Nikon-D7500
used D750
https://www.bhphotovideo.com/c/used/1082599/nikon_d750_dslr_camera_body.html
[doublepost=1526851724][/doublepost]
DX lenses work with Full Frame DSLR. You just don't get the full frame. Inside the camera menu you select the DX mode. It really boils down to which lenses he wants to use and how much he's willing to spend. What I like about photography is the resell value. Lenses will keep their value a lot longer than the bodies. People have sold their entire Canon system and went to Nikon. That's not not a big deal, going from DX to FX when you can sell it. What you put in your bag now that's the tricky part.
Oh the D750 is worth it. If that what you want. The D7200/D7100 are just as good, just not full frame. I think the D7200 and D750 both shoot Full HD. Thats not a selling point for me because I don't shoot a lot of video. What I've seen so far is that the video quality in Nikon cameras have improved since introduced in the D90. Saving $500-700 if you go with DX camera. The D7500 is the newest in that group. It pretty close to the others. One difference I see is that the D7500 has only one card slot oh and faster shutter speed.
D750 vs D7100
http://cameradecision.com/compare/Nikon-D750-vs-Nikon-D7100
D750 vs D7200
http://cameradecision.com/compare/Nikon-D750-vs-Nikon-D7200
D750 vs D7500
http://cameradecision.com/compare/Nikon-D750-vs-Nikon-D7500
used D750
https://www.bhphotovideo.com/c/used/1082599/nikon_d750_dslr_camera_body.html
[doublepost=1526851724][/doublepost]
I will say if you think there is the slightest chance that photography will stick this go round to buy FX lenses regardless. FX lenses will fit crop or full frame, but DX lenses will not work on a full frame. I know way too many people who started with DX and a crop body and then had to rebuy all their lenses when they upgraded bodies.
DX lenses work with Full Frame DSLR. You just don't get the full frame. Inside the camera menu you select the DX mode. It really boils down to which lenses he wants to use and how much he's willing to spend. What I like about photography is the resell value. Lenses will keep their value a lot longer than the bodies. People have sold their entire Canon system and went to Nikon. That's not not a big deal, going from DX to FX when you can sell it. What you put in your bag now that's the tricky part.