Adding to the list... The D7100 also has the magnesium alloy body and no OLPF/AA filter (sometimes less really IS more).
Having shot with a D7100 for a long time, and with the SO having shot with a D5300 for a long time, I can tell you I miss all the cool bells and whistles of the D7100 every time I handle her D5300. That being said, the D5300 images are strikingly good so I would not tell you to expect a big jump in image quality, per se. If it's a good deal on a good D7100 and you want the extra features (of which there are many) the D7100 offers, and the buffer limitation does not bother you (it never did bother me) I'd tell you to go for it.