http://snapsort.com/compare/Nikon-D3200-vs-Nikon-D5100
That's a nice review against each other,
Tbh they're very similar but the d5100 has the flip out screen, ive just bought my first dslr a week or 2 ago and I went for the d5100. Got a used 1 from eBay with kit lens, nikkor 55-200mm lens...