Nikon AF 50mm f / 1.4 D ultra-bright standard lens (Camera Photos)
mounted on a D7000 is a marvel, I am really delighted. AF is very responsive, giving a pro D7000 air. If you still hesitate between 1.8 and 1.4D, save and invest in 1.4 you will not regret, btw I part with my 50 1.8 I have no utility.