im looking to buy a flash for my Rebel XT. the 3 im looking at are the 430 EX, 580 EX, and the 580 EXII. the main questions i have are about the 580EXs. i noticed the 580 EXII is a newer version of the 580EX, but its about $50 cheaper. does anyone know the differences between the 2, or why a newer version would cost less than an older one? the other question is about the 430 EX. i know the first 2 digits of the model number of the flashes is the guide number, so i know its less powerful that the 580s, but its also nearly half the price. would it be a good idea to get 2 430s instead of one 580, and just have the one on the camera trigger the other one off the camera? i dont have any other strobes, so it may come in handy. i have a couple 250 watt continuous lights, but they wouldnt always useful when i wanted to create an effect that only a strobe can produce. i dont have the money to buy something like an AlienBees set up, so i was thinking having a second flash might help when i need an additional flash, and it might help me learn more about lighting techniques. so basically, i guess my questions are which 580 is the better flash for the money and what the differences between the 2 are, and would i get more benefit from buying 2 430s instead? thank you for any advice anyone can give me.