Not wanting to burst your balloon, but have just come off the phone from a friend who is a very experienced photographer who has been using Nikon's for years. We talked about this very subject i.e. 35mm v 50mm and he reckoned the 50mm was the one to go for.
Why? A normal lens is an excellent tool to learn to get closer and communicate with the subjects and creating a presence in the pictures. A 50 on DX is too long to get that effect easily, and too short to get the flattering perspective of a true portrait lens.
Instead of buying a lens when one is not sure which yet I would get a piece of electrician's tape and lock the zoom ring of a standard zoom to the f/l I am interested in and go out and shoot with that for a day or two. Then I would lock it to the other f/l and try that. Then sit down and compare the two sets, preferably printed. After that exercise you know which is better to start with for *you* and *your* photographic vision.
I shoot mostly on FX and tend to like to go a bit wider than normal (35mm) and at the long end for short teles (105-135), but sometimes (quite often) the 50 is "just right".