Whats the best option for me. I wanna buy a couple of flash to use off camera. I wanna trigger it using my 7d or 580 ex ii. Ettl is a plus. I dont really wanna keep walking back and forth if i get a manual flash but if thats the only cost effective option then i guess ill try to learn it. Only one i know is 430 ex ii. Any other option that i need to consider?


