Hey All!! Okay here's the back story. I am heading to NYC for New Year's and can't wait for the celebration in Times Square! I have a D50 and a 50mm f/1.8 and a Sigma 70-300mm... My other lens is broken, but it was a Quantaray 28-90. I am looking for something small-ish because the 50 is technically around 87mm right? lol... So I'm looking for a great new short lens with a fairly low f-stop. One friend recommended the Sigma 10-20mm but I am afraid of the performance in the city at night. Let's get some recommendations!! Thanks!