Peter: it can depend on what you like to take images of, I see birds, so I would suggest the 70-200mm f2.8, top len 105-300mm on that D7000 great camera I own one, but heavy and costs, quick convertion about 1,200.00 pds. As for the lower end, a number of choices. If perhaps you shoot more of the second image, better glass here and then better glass than what you have at the upper end. I myself am looking at the 80-400 4.5-5.6 VR as I shoot mainly landscapes here in Canada with a tripod, so I can get away with slower glass. I use the 16-85mm DX len most of the time as my walking around len. You could go 18-300mm 3.5 DX or 28-300 3.5 FX more or less 1 len covering off your other two. I do not mean you have to stick with Nikkor lens some other makers make some very fine glass also. It is a hard choice and it comes down to what feels good to you as you are the shooter.
Cheers:
Allan