What breed is right for me?

Okay so first things first. im a very active person and i have alot of time on my hands...I always wanted a dog that i can dog sports with like frisbee agility flyball etc. I dont care to much about shedding but i dont really wnat it to be to the extent where its terrible...i have a fairly big backyard so they can run in...which dog breeds do you think would be good for me?