Hey guys, I was looking to get a new flash for my 20D since my old one is about dead. Would like the Canon 580 or 430 EX but they are a bit out of my price range right now. Does anyone have experience using the Sigma EX-500 DG? It seems to have the same specs as the 430EX but is quite a bit cheaper. Local store doesn't carry it so I will have to get it online without testing it or whatnot. Any advice or suggestions would be greatly appreciated.