Just to repeat in another thread, what I always say... coming from a K-5, it's d800 or nothing, unless you want Canon's fast focusing options.
The Nikon D3200 according to
IR resolves about 2500 lw/ph
A K-5 has tested at 2400 lw/ph, but the common test is comparison 2100
The K-30 resolved 2200 lw/ph
So what you've done is ad 8 MP of file size for 100 lw/ph. I know people say different but on 20x30 print, I simply don't believe you can see the difference between, those files. 20 inches/2100 lines give a resolution of .0095 inches. 20 /2500 lw/ph = .008 inches. The difference is .0003, 1.5/1000 th of an inch...sorry, I don't beleive you can see that.
A K-30 gives a line width of .009 , so one thousandth of an inch less line width than a D3200.
I noted someone posted that the human eye can see over 1/500 of an inch, or 2/thousanths, of an inch, so unfortunately, even in the article posted to support more MP equals better, he had to go to a D800 to prove his point, which is exactly what my own research has shown.
By the way, a human can see 1/600 th of an inch, from 8 inches. That for most people is not a normal viewing distance. Someone with really good isight might be able to tell the difference between a D3200 and K-5 image blown up to 20 inches by 30 inches, from a distance of 8 inches away... or they might not. My advice would be keep your file sizes down and wait for something that gives you a noticeable difference. 24 Mp doesn't seem to be it.
Before you buy your D7100, D3200, or D5200... you might want to consider the numbers as they relate to real life performance. You might get a teeny tiny little bit more, but it might not be enough to even notice. That's what I found comparing my K-5 images to D3200 images. No practical difference.