Honestly? I just did a side-by-side-by-side on Nikon's website and here's what I think (it's worth the price of admission).
1. I see absolutely no reason for you to move from a D5300 to a D7100 outside of the ability to use AF glass without a built in AF motor. Everything else is such a small step up, and in some cases (ISO) a step backwards. 51-pt AF system is the only other real gain.
2. The D7200 buys you better ISO performance, a bigger buffer, 1 add'l fps, the better AF system, the use of more glass, 9 frames of auto-bracketing.
If you haven't ever said, "Dang, I really wish this camera had/did ________", with any of the things mentioned in #2 then you're spending money needlessly.
I'm not telling you not to. I'm thinking there may be other things that could push your photography further with your existing body that might be a better way to spend your money. Maybe a couple good primes? Something to stretch you a bit. Otherwise, I personally believe that the D7100 even at a great price is money poorly spent given what you already have.
Do yourself a favor and use Nikon's comparison feature on their website. You'll be amazed at how little is different.