Okay, I'm starting to get into the market for lens upgrades... I shoot a Canon back, and my current lenses are an 18-55 and a 75-300 F4-5.6 I'm looking first at the zoom, as I shoot a lot of hockey games, and will need to rely more heavily on that lens this fall/winter. The arena is pretty dark, so I need a fast lens. I'd love to go F2.8, but I doubt I could swing that kind of price. So does anyone have any suggestions for good, decently priced lenses? Thx!