i do have a d7000 and a d700. depending on your needs, one may be better than the other. the d7000 has become my preferred body for newspaper work for the very large files that allow me to crop as i please and the shooting rate that is just a little faster than with the d700 (6 frames per second vs 5). however, in february, when i shoot the fireworks display at winter carnival, the d700 becomes the choice because its full frame allows me to get in a wider panorama.
regarding performance issues like autofocus and high ISOs, i am equally happy with both. the one glitch i found with the d7000 -- that it initially had problems with the nikkor 50mm f1.4, my favorite lens for getting close at basketball games -- was solved with a little custom focus tweaking. yesterday, i spent 8 hours shooting 5 high school basketball games for a newspaper with the d7000 and the 50mm and was delighted with the autofocus performance. i expect the same will happen with another old favorite -- the 85mm f1.4, which also needed the autofocus adjustment.
another consideration is weight. the d7000 is considerably lighter than the d700. now you may dismiss a few ounces difference, but as age catches up with you, it becomes important. i've got bursitis from spending hours at a time with my left arm bent like a chicken wing (too often a pod is impractical when tracking action). cutting a little weight helps a lot. i had the same experience when i used to go around with a pair of d1 or d2 models hanging around my neck. when i switched to lighter models with the d300 and d700, the chronic neck pain disappeared. as my dad used to say: "getting old sucks."