Colton Orr gets my vote as well.
Overall, I'd say that
Derek Boogaard is the biggest and most destructive power puncher in the league, because he is huge and nobody wants to go toe-to-toe with him, but he just wasn't active enough this year. He was hurt for a lot of the year and didn't fight a whole lot. So since this is based on purely this year - it's
Colton Orr, who packs a very powerful punch.
Boogaard and Orr are the two hardest punchers in the league.
Even though Parros scored two TKO's this year, I've never thought of him as a power-puncher. It doesn't seem like he packs a very strong punch to me, so I was actually surprised when he put down Cote this season. Just my opinion.