There are only three 35mm lenses currently available from Nikon now.
35/1.8G - cost around $330, great for DX, sharp contrasty.
35/2D - cost around $500, FX lens, but not as sharp or contrasty as the 1.8 and max aperture is not as large as 1.8.
35/1.4G - Cost over $2k. FX lens, very very good but price also reflects that.
So in the end, for a DX cam like D7000, the 35/1.8 is cheap and good.
And why 35mm for D7k? because on D7k it gives FOV similar to 56mm lens on a FF cam. This makes it close to a normal lens (view of human eye). And a normal lens is used a lot by photographers from old days till now.
BTW some of KRW's advice you have to take it with a pinch of salt.