Bigger puncher - Gerald McClellan or Kelly Pavlik?

I remembered today that Arum called Pavlik the hardest punching middleweight he'd ever seen. I wanted to see whether anyone agrees with him. Obviously Pavlik's a hard puncher, but the hardest at 160 ever? I actually think McClellan had more brute power, I also like Hearns's pop more. Pavlik's a crude puncher, he doesn't really get a great deal of leverage much of the time I've notice but his power seems to come from his shoulder, it's quite unique. He times the uppercut very well.