Richard Hatch , Jun 11, 2012; 01:56 p.m.
The 600 has features and functions that you probably don't need or can't use... so take that off your list unless you want what it has that the 580 can't do and know what to do with it....
That said... the 580 or the 430 will work for what you are doing. I have a 580 and frequently max out its power so for me I'm happy I got the 580 instead of the 430. More is better but you pay....
I shot all these with a 5DMK II and one 580 in various configurations.
OBTW.... HDR on skin is hideous! (my opinion)