Comment Low-End Nikon, Fast Normal Lens (Score 2, Insightful) 812
Go for a low-end used or new Nikon SLR body and buy either their 50mm f/1.8 ($90 or so) lens or their 50mm f/1.4 lens (about $300). The f/1.4 is very expensive, but it takes photographs in very low light.
Definitely start off on the fixed 50mm, because it will force you to think about composing the frame; you can just zoom it away.