#3? Ehh. that's tough. Some lists online include Ovechkin as a power forward: dude can check and he doesn't shy away from contact so if he counts he'd be my #3.
To me, that's stretching the definition of a power forward. Power forwards, to me, are the guys like Tkachuk, Neely, Shanahan, Tocchet, C. Lemieux, Mellanby, K. Stevens that actually went to the front of the net and worked that area. Able to take the punishment in front of the crease, give out the punishment in front of the crease (not needing to skate to hit - *cough* Ovechkin *cough*), while having the skill to score while handing out or taking that same punishment. Of course, with the rules shift this century the power forward role is changing.
Can't believe I forgot about Gary Roberts! Goon mentioned him, he'd be in my #3 for sure.
Yea you wonder how much longer there will be a "true" power forward classification. I still think it can be done. You just have to be faster (both on your skates and with the puck) than in years past but the physical presence along the boards, in the corners, in front of the net, I think it's still there.