I shoot quite a bit of low-light and night photography of the local high school marching band. I have a refurb'ed D5200, this was way better than my decade old D40X, which was really bad in poor light that I shoot in. Since you already have already own 3 DX lenses, I would stick with a DX camera, because personally I am always running on a budget.
But the feature that I like about the D5x00 cameras is the articulated viewing screen. You can take low-angle shots and high "over the head "shots with practically zero effort
True, there is not all of the bells & whistles of a D7x00 camera, because the D7x00-series is way north of advance amateur gear and borders on low-level pro. I would say D7x00-series is the equivalent of a D90 in the Nikon line in its day.
BTW if you can find the equivalent Nikon refurbished equipment buy it, I have bought much of them, and you can save quite a bit of money and if you are a worried about camera repairs buy the warranties offered by the retailers.. But personally I don't think you will really need it. From what I can see the only difference is that don't have the fancy box and the 3 year warranty, it comes with Nikon's 90 day. BUT I have never had any Nikon equipment fail me, and I used my old D40X for at >150,000 photos. and it is still going strong and I still use it to this day. If you are collector of camera equipment, I suggest the 1st quality because it comes with with nice box, collector value decrease quite a bit without the original factory box.