TTArtisan AF 27mm

That'd be a good one for staying relatively out of people's way and getting some up close shots of things. Their lenses are also built quite well despite how affordable they can be. 28mm tends to be the general street photography focal length too, nice and wide

The camera and its 16mp sensor are fine, really. Just pay attention to exposure and learn the histogram and you'll get some nice shots out of it. :)