It's important to note that although everyone wants to be able to open their lenses as wide as possible, you don't gain much performance in the faster Nikons and in some cases the results can actually be worse. It's a general rule that lenses are their sharpest a few stops down from wide open anyway, but the scale isn't consistent throughout the entire range of lenses. The 50mm 1.2 for example is can be quite soft and exhibit some distortions when open all the way, and really shouldn't be used any faster than 1.8 in a professional setting. The 50mm 1.4 and 1.8 however are near equally sharp at 1.8, so there's not a lot of point in spending the extra cash for almost imperceptable gain. Just like "more resolution" doesn't always make a better camera, faster apertures don't always make a better lens. Keep this in mind when determining which lenses to purchase.
Here are some good sites that review and reference the range of manual and automatic Nikon stills:
http://www.naturfotograf.com/lens_surv.html
http://www.kenrockwell.com/nikon/nikkor.htm#mf
http://www.kenrockwell.com/nikon/nikkor.htm#af
Here are some good sites that review and reference the range of manual and automatic Nikon stills:
http://www.naturfotograf.com/lens_surv.html
http://www.kenrockwell.com/nikon/nikkor.htm#mf
http://www.kenrockwell.com/nikon/nikkor.htm#af