I've got about $400 to spend on a refurbished Nikon. Pretty much limits me to a D3100 but if I could be convinced the jump to a 3300 or 5100 weren't just a megapixel thing or a video thing (which I'm not into) I may do it. Any advice appreciated
Taking a very quick look at Amazon, I see that to be about the current going rate for a refurbished D3200 with the standard 18-55mm kit lens. I see a D3200 body only for about $300.
One thing of which you should be made aware, if you're considering going from a D3000 to a D3100, is that for some odd reason, the D3100 does not support an infrared-based remote control, even though both the D3000 and D3200 do. This came up in
another thread. If you care at all about being able to use such a remote, then that, by itself, is plenty of reason to skip the D3100 and go at least to the D3200.
The D3200 is also the earliest camera in the D3?00 line to support the WU-1a unit, which lets you control the phone from your mobile device and transfer pictures from the camera to the mobile device.
From D3000 to D3100 seems like much too small a step to be worth nearly as much money as you're thinking of paying to take it. It doesn't look like they added any significant features to the D3100 over the D3000, other than more megapixels which you seem to be claiming not to care about) and a faster processor; in fact, they removed at least one significant feature. The D3200 at least gives you back the support for an IR-based remote (which the D3000 has, but the D3100 does not), as well as support for the WU-1a wireless adapter, even more megapixels, and an even faster processor.