My Golden Civet has 325 speed at level 25 so faster than most. I haven't found a good way to use him though. Do like that my Fawn has 305 speed since he is my healer and dodges most attacks.
I go for power. My favorite is my crab with Emperor Crab at 325 power. With shell shield and renewing mists he outlasts any enemy and when he hits them with his claw he packs a punch
Crimsom Geode is also deadly with 329 power at level 23