Both cameras has about same image quality and low light performance.
D7100 has better auto focus system, second command dial, weather sealing, better build quality, flash commander and many more stuff you might or might not need/use.
D7100 is also bigger and heavier and has in body AF motor which is good if you buy older "D" lenses
If this was my only camera I shoot then I would definitely want the D7100 over the D5300.
Only you can answer that.Both cameras has about same image quality and low light performance.
D7100 has better auto focus system, second command dial, weather sealing, better build quality, flash commander and many more stuff you might or might not need/use.
D7100 is also bigger and heavier and has in body AF motor which is good if you buy older "D" lenses
If this was my only camera I shoot then I would definitely want the D7100 over the D5300.
Is the whole return process worth saving the extra money and I guess a better camera?
Only you can answer that.Both cameras has about same image quality and low light performance.
D7100 has better auto focus system, second command dial, weather sealing, better build quality, flash commander and many more stuff you might or might not need/use.
D7100 is also bigger and heavier and has in body AF motor which is good if you buy older "D" lenses
If this was my only camera I shoot then I would definitely want the D7100 over the D5300.
Is the whole return process worth saving the extra money and I guess a better camera?
Ask yourself how serious of a photographer are you ?
If you enjoy shooting from time to time then the D5300 is good enough, if really is an excellent camera but if you really want to get very serious with your photography then the added features, better build quality and more would make it worth your while to make the swap.
I'd say get the 7100: I've been there and regretted not getting the D7000 over the D5100
You won't second guess if you should have purchased the better camera body. Additionally, your photography can grow for a longer period of time with the D7100
D7100 also has no AA filter.
The screen on the d5xxx system is nice and handy but that's user preference.
The d7100 is a better long term camera in my opinion. A lot talk about in body motors and while that's a benefit for some, not everyone wants to buy older lenses.
The d7100 has better weather seals and is more rugged when teamed with weather sealing lenses. It has a better af system. It supports cls lighting system and high speed sync which allows more creative freedom. It's shutter is rated for more shots (I think) and it had dual memory cards which some find happy. It's a step up in performance from the already excellent d5300