Who hits the ball the hardest on the forehand side?

I used to think it was Gonzalez, but after watching Tsonga, I have to say he has the the most powerful forehand in tennis, in terms of pure brute force (it's like a heavy flat forehand). Rafa hits with lots of torque and can sometimes flatten it out on that side, but Jo just destroys the ball when he hits it. I love that shot of his. What do you think?