First of all I'd like to say that I'm a hobbyist, not a professional photographer, and only recently did I get into flash photography. My current setup is 550D + 24-105L, but I'm getting one of the 5Ds (ii or iii) when the latter is available. I'm mostly shooting general "walkaround" photography with some lean towards press photography (e.g. political meetings and etc.). I also shoot at weddings, family reunions, that kind of thing. So now I need a flash since many of these events tend to happen indoors, and I'm currently deciding between 430 and 580.
From the looks of it I'll have only one flash for the time being (I'm not a studio photographer, more of an action one), and 580 seems to be easier to operate. On the other hand it's much heavier than the 430 and costs more. Do you experience this additional weight problem, and do you feel that the price difference is justified in this case?