This is the ages old question but with a slightly different twist. I need a decent tele to shoot at darkened events. The stage will be lit but the audience sits in the dark. I can actually move up near the stage to get really tight shots so shooting offhand with no tripod is my MO. Perhaps with a mono, though, I tend to pop up and down so as not to block the audience in the front row. Most of the people on stage are sitting or at a podium. They do walk around the stage but not much. I have a Tamron 17-50 2.8 and that works nicely for wider shots and shallow stages and my reliable 50 1.8 is always in the bag. But I'm finding I need a 70-200 or 70-300. I'm shooting a Canon 30D with a 430ex flash. Sometimes I can use the flash, other times not. I can safely push up to iso 1600 and occasionally 3200. I'd love to get a 70-200 2.8 or even a f/4 IS but that's a bit out of my budget. So my three choices are the 70-300 IS, 70-200 f/4 non IS and the 200mm prime 2.8. The latter is at the edge of my budget but doable. The lack of zoom flexibility might be tough, though. I like the idea that the "L" glass would be far sharper throughout the range so almost like having an extra stop over the 70-300. But that IS really seems to be right for this situation. Any advice? Thanks.