I was here years ago. First camera was a d90, then a D7000. Somewhere along the line I lost interest in photography and sold ALL my gear. Still kicking myself.
I caught the bug again and just bought a d7100 and 50mm 1.8 two days ago.
Such an awesome camera. Have only taken maybe 40 shots so far but I already love the camera. I was looking at the d600 as well thinking I may go full frame but after reading reviews it seemed to me the 7100 was the superior camera, minus the full frame. Focus speed was important to me because I like photographing fast cars, and the extra reach of the DX helps.
I'm into all types of photography. I just like taking photos so there won't be a perfect camera for doing everything but the 7100 is close to it in my opinion.