Okay, I am about to purchase an off-camera flash setup but I do not know a lot about exactly what I will need. Currently, I have a 430EX Speedlite for my Canon, which initially I will use as a slave unit (despite it's lack of power compared to the 580 or studio strobes). I plan to get a 580EXII as my on-camera master. I decided to go with a battery flash setup since I will not have to put as much money in, plus I will need it for on-location shoots. So my question is basically this: I realize that I will need to purchase the Speedlite, lightstand and a softbox or umbrella but what else will I need to make this setup work? Do I need a lightstand adapter to connect the softbox (in MOST cases)? I have never used a speedlite as a slave, so are lightstands typically already capable of attaching my flash unit to? Any help is greatly appreciated!