For me it would have be the lotus position. It looks very intimate where you can wrap your arms and legs around your partner and look into eachothers eyes while doing it. I would also love the woman-on-top and missionary, of course!
The reason you're not getting many replies is because this topic has been done to death. My favourite position is doggie-style, though. Nothing like getting done from behind!
I love the lotus position. Her body feels so good when its rubbin up against me. We almost always cum together in this position...