What is your budget? Lots of choices, but also depend on how far away you are. If you are far, you will need a long zoom/tele with a large aperture because flash will not help (very expensive). If you are close enough, the 28-135mm IS is a good option, your stock 17-55 will work too. If you are close enough, an inexpensive option would be the 50mm 1.8 lens. I have found that I use that lens alot more than I thought when I bought it, a nice lens at a great price. Good luck.