I'm not impressed with #7. I would like to see more color and I think the graphic portion would be too small on business cards.
#6 is a good use of color.
I really like #5. I like the use of color and I love to way you've incorporated the components of the triathlon.
I would like to see if you could use a third color. For example, one color to represent swimming, one for biking, one for running. I'm not sure if it would work, but would like to see it.
#10 is really my favorite, but the team thought the idea of the shield looked too much like a police badge.
Some of the team members really liked # 6 which is why I re-ranked it higher. I don't know if there is anything you can do to make it more distinctive, but that would help.