It is not much of a dark horse, but I'll take Earlham to get in for class 1A. Most picks I have seen have Colo-Nesco making it in over them. They are team with a lot of length and have 5 guys that can go off for 25, but are better on night's when they are balanced.
Also, I'll take Creston in class 3A in a substate with a some similar quality teams including Harlan, D-S, Carroll etc. They are no stranger to tight games, which is great for this time of year. Get on the back of Jay Wolfe and hold on boys.