Flash questions???

[Deadeye008]

Been looking at getting a flash for my Canon 30D. I found these two:
http://www.adorama.com/NIDI622C.html?searchinfo=ettl&item_no=3

http://www.adorama.com/SG500STEOSDG.html?searchinfo=sigma%20500%20dg&item_no=11

Which one would be better? Does anyone have experience with any of these or any suggestions of another flash in this same price range?

Thanks