Are you thinking a powered auger or a hand crank? What are you planning to fish the most for, panfish or big pike and other toothy critters? An 8" hole will most likely handle all but the hugest pike. I use an 8" for crappie and other fish; it's plenty big in my opinion. I would not want to hand crank a bunch of 10" holes. In fact, I used a hand crank for one season then invested in an 8" powered auger.