What's a great lens for the Nikon D7000?
Not extremely cheap, good and professional… Not too expensive.
Like, what's a good one foe landscape / portrait / macro?
Take a look at the Nikon 10-24mm, its a good wide angle zoom lens and would be perfect for the kind of photography you are looking to do. Read this review to get more opinions on the lens:
http://www.amazon.com/...RMG89GYZO/
There's a good price offered for it here:
There are some 64 million lenses made by Nikon since 1959 that will work with the D7000. Perhaps you can elaborate a bit more as to what your needs are.
Landscape, portrait, and macro are different categories, but there are still a lot of choices in that range.
Perhaps the best Landscape DX lens at this point is the Tokina 11-16mm, at around $700. A Nikon 10-24 is also available, for around $900, but it has a consumer-grade variable aperture.
For portrait, anything from a Nikon 50mm f/1.8 ($200), a Nikon 85mm f/2.8 ($1, 200), Nikon 135mm DC (Defocus Control - $1, 200) or even a Nikon 80-200mm f/2.8 or 70-200mm f/2.8 ($1.200 to $2, 400) can be used.
And for macro, a Tokina 100mm f/2.8 macro ($450) or a Nikon 105mm f/2.8 micro ($950) is a good choice.
There are less expensive lenses, but all of these lenses are more or less considered pro grade (non-variable f/2.8 or faster).
Let's review. You want a professional lens that can be used for every type of photography that is not too expensive?
I'm not even going to bother answering, not only because such a lens does not exist, but because it is clear by your question that you are completely clueless.
Jeez, really vague description you got there. If you want a single lens that can do all those things, the Tamron 17-50mm f2.8 (non VC version) is a pretty nice lens according to reviews.
If you want a single lens for each category, then get the AFS Nikon 50mm f1.8G for portraits and AFS Nikon 60mm f2.8G for macro. For landscape, your kit lens will do fine.
Please define cheap. $100, $5000? Good is relative as well.
For portrait and macro, the 40mm f/2.8 would be great. The 50mm f/1.8G would be excellent for portraits, all around and low light.
If you were looking for a zoom lens then you have to pay more, get worse quality and smaller aperture. But the extra range is great.
Here's a Lens Buying Guide - http://www.the-dslr-photographer.com/2009/11/buying-a-lens/
Nikon 55-300mm f/4.5-5.6G ED VR AF-S DX Nikkor Zoom Lens is fantastic - especially for $399. My first concern was whether it not it had a plastic or metal mount since some DX lenses in this price range have plastic. I even contacted Nikon and they couldn't (or wouldn't) tell me. Well, I was really pleased to see that it does have a metal mount. It has a nice solid feel to it. The zoom movement is smooth and I haven't had any problem with lens creep when I'm aiming it downward. Even when I point the camera downward and shake it, it won't creep.