i think the x-5. i boarded behind one about a month ago with a 400lbs sack in the back and 5 people in the boat. it was a closed bow so we coupldn't put any weight up front. the wake wasn't as bad as i thought it was going to be being that its a 19 foot i drive. it wasn't great but it would be a lot better if you could throw a 500pound sac up front and probably 800in the rear.