Is there a great lens that works on both Nikon D80 and D7000?

From any price I guess.

About 65 million of them.

Virtually every lens that will work on a D80 will work on a D7000 and vice versa.

The only real difference is that the D7000 has an "AI feeler" which allows it to couple with an AI lens's aperture index so you don't have to put the camera into manual mode. But that only applies to older "AI" type lenses.

If it works on a D80 it works on a D7000.

Great lenses…

Wide, nikon's 14-24.http://www.nikonusa.com/Nikon-Products/Product/Camera-Lenses/2163/AF-S-NIKKOR-14-24mm-f%252F2.8G-ED.html or tokina's 11-16 http://www.tokinalens.com/products/tokina/atx116prodx-a.html

Standard: Nikon's 24-70: http://www.nikonusa.com/...8G-ED.html

short tele, the 70-200 http://www.nikonusa.com/...VR-II.html

Nikon lens;

10.5mm f2.8
14-24mm f2.8
17-55mm f2.8
24-70mm f2.8
35mm f1.8
45mm f2.8 & 85mm f2.8 for tilt shift…
50mm f1.4
50mm f1.8
60mm f2.8 macro
85mm f1.8
85mm f1.4
105mm f2.8 vr macro
135mm f2
80-200mm f2.8
70-200mm f2.8 vr
200-400mm f4
200mm f2
300mm f2.8 vr

Well there are so many lenses that will work on both cameras, as they are both DX type.

Here's a Lens Buying Guide - http://www.the-dslr-photographer.com/2009/11/buying-a-lens/

My only comment to this question is "The cheaper the glass usually equates to degraded images" so choose wisely and not by price.