I'm a big fan of the D7000, coming to it from the D5000 as my only other DSLR experience. I spent a year learning about DSLR, getting comfortable with shooting the D5000, and dipping my toes in the waters of post-processing.
The D7000 is a great camera. Since most of my work involves action-oriented "candid" shots of dogs, DX format makes a great deal of sense. I'm never wanting for "width", and 24mm is typically as wide as I ever need to go.
The D7000 rewards good technique, and it rewards good glass: put all three together, and you can create some breathtaking images. If I were in your shoes: I'd do what I did, and spend some time with the lenses you have for DX, and then figure out where I spend the bulk of my focal range, and get "pro" quality glass to cover that range. I went Sigma EX for the 24-70 range, which is probably 75% of my shooting; I splurged for the Nikon 70-200/2.8 VR-II for my telephoto - and am amazed at the detail, bokeh, and subject isolation this lens affords me (well, really, I'm amazed at everything about this lens, but, I'm easily amazed). I can take a shot of a dog and have one side of their face in razor sharp focus, with the other side starting to blur. The effect is eerie; I'm looking at one such image right now, and am, well, amazed.
I have added the MB-D11 grips to both my D7000 bodies. The extra heft of the grip, along with the extra battery life, definitely helps me quite a bit. You might consider doing the same; I would, at a minimum, play around in a camera store with the grip, and see how it feels in your hands. I did try the cheap plastic Meike grip alongside the Nikon grip for a couple months, and recently dumped the Meike grip in favor of another MB-D11.
I'm no technical wizard, but it's my understanding that most Nikon lenses can be used on the D7000. It's got an internal focusing motor which makes this possible. Obviously, any modern FX lenses work just fine. I'm trying to purchase FX-capable lenses when possible, because I have a feeling I'll be forced to move to FX someday.
Not because of deficiencies in DX, but because if things continue evolving for me the way they've been, I'll need pro quality bodies. It looks like, in Nikonville, that means FX.