I had the D50.  Much easier to use for me (because I'm a novice), but also much less capable.  I think the 7000 is just a little twitchy.  It is obviously a very advanced camera, but getting the images you want, at least in my experience, is not a snap.  Part of that is because I have advanced in terms of what I want to capture and am still learning, but part of it is that the D7000 seems like it could use a little bit of refinement in its AF system. 
 
 
EDIT: If possible, I strongly recommend renting one to see how you like it.