Hi all. Nd some advise on Flash. I've just burn a big hole in my pocket on 350D & 2 lens. Looking a flash n torn between sigma 500 super GT TTL2 n canon 430EX. Shd I pay less for a sigma with close to 580 functions or shd I settle for a more expensive 430EX???? Got alot of gd feedback on 430, but wat abt the sigma? pls show me the light.