ok so many of you have said to complete my setup I need to get a flash.
I really like the Sigma 500 flash, there are 3 different kinds though.
500 DG ST TTL 150 on pricegrabber.com
500 Super TTL 200 on price
500 DG Super E-TTL II 205 on price
anyone have any of these and should I just get the DG Super cause it probably has the most options?
done a bit of research and there is are some differences, but i'm not sure how to make sense of it all.

