I'm looking to get a new piece of equipment but I'm not sure weather to get a flash or a fast lens. I'm really into photography, however I don't know much about either (flash or lens). I'm starting to get really into live music photography and I want to be able to capture the picture in low lighting but I don't want to wash it out with my flash. I also can't do a slow shutter speed because they're moving to fast and it doesn't come out not blurry. tri-pod isn't an option either. I was just wondering if anyone had any tips on what I would benefit more from buying and also what the differences between flashes and fast lens's are. like what's a good flash and what's not. PLEASE HELP!