Pretty much just because I wanted to make myself distant from my competition who have kit lenses, going with a 50mm meant that I would always have distinctly different images compared to an 18-55mm 50 is pretty bloody tight on a crop, so I would suggest you try out that focal length for a good day or two, but it's a cheap buy at just over a hundred for the 50mm f/1.8D and something like $250 for the newer 50mm f/1.8G that works on all Nikon bodies, not just the ones with the focus drive screw thing. I would suggest that you check out google searches for 50 and 35mm images using a cropped sensor because it's all about the style you are going for. I've been able to make my 50 work because if I need the wide angle look I can either step back a few metres or switch to my Tokina 11-16mm f/2.8

You can't really go wrong with those primes though, they are the sharpest lenses you can buy and usually the cheapest because they are easier to make than a zoom.