I'd try opening your lens all the way up and shoot at the lowest speed you know from experience you can hold..and see if you like the results. In the end, it is a night shot and you probably want the shadows to go black anyway so. ...Missi's picture above is a good example. If you shoot handheld a lot at night, I'd highly suggest a range finder of some flavor...that alone is good for about 2 shutter speeds.