He's seven feet tall and his skills look a bit raw, but sometimes he handles the ball with amazing grace, and the minute you see him work his way into the paint, you see he's one of the strongest, most instinctual centers in college basketball. Without David Harrison, their junior redwood from Nashville, Tennessee, the Colorado Buffs might be an ordinary also-ran in the tough Big 12 Conference. With him, they're a tournament contender and an upset threat to the big dogs of the league, including vaunted Kansas. Harrison completed the regular 2003-04 season averaging seventeen points, nine rebounds and almost three blocked shots per game -- team highs all -- and coach Ricardo Patton has counted on him to give the Buffs muscle and the power of intimidation. That could end soon: At last report, Harrison was considering forgoing his senior year in Boulder for the NBA draft.