I had both the d5100 and D7000 on my recent vacation trip. While the D7000 I used for his higher MP with a wide angle lense, I kept a 70-200 Sigma on the D5100.
Only problem I had was I kept bumping the D7000 from Aperture mode to Manual mode. I lost half my pictures from Daytona because on the walk up to the grand stands I bumped the camera out of A mode into M mode. They really need a lock on that. But since I had already checked my test shots, I just fired away and did not realize till I got back they were all over exposed.
I know, my fault I should have checked. But when using A mode, it should just really be point and click and generally is. But for some reason on this trip, twice I bumped the camera into M mode.
Or.... I was in St. Augustine as well. Perhaps it was a ghost? Hmmmmm.....
Oh on a side note (after the Daytona Trip). My D7000 somehow fell out of my camera bag..... The sound of a several thousand dollars hitting cobble stone can really break your mood. Only damage, was a broken $150 UV filter and lense hood (and ego). I could not zip the bag all the way shut, but there was really no way it should have fell out... Ghosts again maybe? Anyway... The point is, that D7000 is built rock solid. Does not even look like it was scratched in the fall. I might send the camera and lense in later in the winter, just for a checkup.