Im Nikon shooter. I shoot sport events. I have been approached by someone who owns this camera and wants to shoot with me. I should point out I make my living (meager thou it might be) from doing thsi (and other stuff). I have an event coming up that will be typically in lowish light and fast paced. At an average event each photographer will take up to 5-6K images a day. Is the Canon EOS 550D good enough for this. Whats its low light usability. Can you create folders on its sd cards to match routine numbers at the event? Any one who can shed any personal light on this would be appreciated. Can this canon shoot with auto ISO like the nikons can?