The 50/1.8 is great starter-lens. Sure, the build sucks and the AF is noisy, but it's really sharp from f/2.8 and up and at f/1.8 it's 3 1/3 stop faster than the kitlens. Allows for lowlight-photography and you can play with a small DOF. Also the fact that it's a prime (fixed focus) can really get your creative feelings going.
