I'm thinking about replacing my D200 with a D7200. no, it's not a D500, but it's only half the price of a D500, which matters to me. I've never used Live View, so can I rely on that to focus my 105 2.5 ais, or is that not a good solution? With my shooting eye suffering from macular degeneration I have to now use my right eye, and really need all of the AF I can get. Maybe Live View is a help there on the D7200, I dunno.
Live view works great for focusing if your camera is on a tripod and the subject doesn't move much. For hand held shooting, I don't think it's so very practical. To focus, you need to zoom in the image and then you don't see the whole frame so composition can drift while you're focusing if the camera is not fixed in position.
Have you tried using the manual focus confirmation dot? I find it works well when focusing the 135/2 Zeiss.
The D7200 appears to draw high praise, although 24 MPs will probably kill the use of my 18-200 and 12-24, so they will need to be replaced also. Being retired and living on a fixed income means that i need to spend wisely, so I want to hear what the folks here think before I do something that I'll later regret.
I don't think there will be any problems using the 12-24/4 on a D7200, though I haven't used that specific combination. 24MP DX can be excellent if your lens is up for it but the image quality doesn't become worse just because you increase the number of pixels - generally speaking in the worst case it can stay the same, or most likely become better as long as you view the final image at the same size and from the same distance.
The 18-200mm also should not be worse on a D7200 than it is on a D200. I think it is always good to remember what the final print or presentation size is instead of worrying too much about the individual pixels. Still, if you're unhappy with the 18-200 on the D7200, there are now some alternatives e.g. you could get a 18-140 which has been recommended (I have not used it though); I would stay away from the 18-105 as that lens I don't like though. The older 16-85 is reasonably good and there is also a newer, but more expensive 16-80 with a faster maximum aperture. The Nikon professional 17-55/2.8 DX is suprisingly inexpensive in the used market and it is an excellent lens you may want to consider, if you can find a nice clean copy which hasn't been banged around. You may need some fine tuning of the AF to make the best of this lens.
I know it is more expensive but the 70-200/4 Nikkor is an outstanding lens which I really like a lot, it gives a very pleasing image, is lightweight, and you can shoot it wide open without any significant drawbacks. Focusing is excellent as well.
The D7200 AF system should be a revelation, coming from the D200.
So money permitting I would perhaps replace the 18-200 with the 17-55/2.8 Nikkor used and the AF-S VR 70-200/4 if you find one available at a suitable price. I would keep the 12-24/4. If these are too expensive then perhaps some lenses with smaller apertures would be suitable, but I would first try to find these lenses used.
I think the D7200 will be seen as a classic due to its balanced feature set and image quality.