Best two:
Scorpians / Blue Sharks (These two are awesome)
Worst two:
Miami Cruise / LA Wave
I'm not a fan of the boat or the wave. I'd experiment w/ a cruising ball (why not implement the sport into the logo instead of a boat) and maybe an energy wave instead of an ocean wave. I think these two are too cartoonish.
The rest are all very good. It was hard to pick out the top two, but easy to pick the bottom two. Overall, a very good job. Hopefully you take my post as a compliment -- constructive criticism is a good thing for improvement.