If you are just starting digital (esp. FX), and have not a 50mm lens, go straight for the AFS 50mm f/1.4
Assume money is small concern. This is an equipment forum.
I think the AF is better overall (unless the AFS proves to have much better IQ which i doubt)
AF can AF very fast, backward compatible with film cameras (never say never when it comes to THAT dark side :devil

the AFS imho is more for the D40,40x,60 users who need AFS to autofocus. and only if they are sure they will not upgrade their camera body