hmmm- depends on the mood and the partner I guess:
Had a GF a long time ago that liked (actually loved) doggy greek- but with me holding her wrists to be able to pull hard for a serious pounding. Nothing like it for intense hard core screwing.
I have always wanted to try with a woman who could do the ankles behind the head thing. Again seems to me to be the best possibility for just pile driving when the mood is intense. But then I will not know till I get to try. In the meantime...
http://www.tube8.com/hardcore/yoga-porn/26536/
When there is great chemistry and connection, slow and sensual CG is my favorite. I get a view of eyes, breasts and undulating hips as well as a slow build up. Also lets us move together well.
Lastly, if I am able to recapture some of the control and patience I had as a younger man, any position that lets me be in control (mish or lazy doggy with lots of pillows) so that I can vary pace, depth and intensity. When a woman who is responsive to sensuality is a wonder and being able to be the agency of that passion (or at least be there to encourage it along) is very fulfilling for me. Slow and slower, deep and shallow, steady or not as the mood and encouragement calls...
...ok- think I have written myself into another shower here.