I shoot mainly bands and have two weddings coming up. Also I do artsy self-portraits and kids portraits for family and friends which I have indoor studio lights for. I have only a 28-80mm lens and a Rebel XT. For my non-digital I shoot with a Canon AE-1 and use the Vivitar 285HV. So I'd like something that is similar to that. I'm torn between the two flashes. But how much difference is there really? I know the 580ex has more power and is a bit smaller. thanks!