I have the 5100 and am very pleased with it. Having said that, I did a lot of research before I bought analyzing what I wanted to do with the camera, what type of shots, what my budget was etc.
Good function and not too expensive will not cut it is it does not fit what your photo goals are.. Analyze those vs the 5200, 3200, 7000 and the FX cameras.. If the 5100 meets your goals, by all means grab it!
Pat in NH