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The nikon ai-s 20mm f/2.8 is very good. There's also the sigma 20mm f/1.8 which is great too. There's a couple of slower nikkors the f/3.5 and f/4 which cost less.
I'm stuck on a nikkor-mount. Is 20mm f2.8 the fastest lens in 20mm?
Yes, also it is terrible. (but the Sigma 20 1.8 is worse. Much worse.)
Get the new Nikon 24 1.4, it's sharper @1.4 than the 20/2.8@2.8. Stop it down to 2.8, it's like comparing a master prime to a tamron. http://the-digital-picture.com/Revi...p=630&CameraComp=614&SampleComp=0&FLI=0&API=3
Don't know your budget, but the Tokina f2.8 11-16mm has been a great lens on crop sensor cameras. it is also constant aperture so it doesn't change exposure when you zoom. If you need anything faster than 2.8, than you need to rethink your budget or try renting. The D7000 has pretty good noise tolerances, so you can push it further than some other cameras a bit.