I like #3 in general. Clean, Web 2.0-like, and it has a graphic. Very good. I don't like that the .com is squeezed in (I'd rather have it gone than squeezed in like that), and I'd like the graphic to be more integrated (maybe in place of a letter in "integrations"?)
Can you make #16 more stylized? Currently, it's very flat. It also seems a little out of proportion (the waves are quite large compared to the center circle).