I voted for AMD... just think back to when Intel had the performance crown... AMDs had the lowest prices. When the X2's came out the 4800+ was right at $1000 and the nearest non-extreme dual core Intel was around half that if I remember correctly. Just makes sense that AMD will be forced to undercut Intel's prices for the near-term.
Never going to happen....at least not while the CPUs are still new and selling from retail stores. I suppose on the used market, the AMD athlon 3600 X2 will be the first to be had for under $100, but I can't see that happening for at least a couple more years. Single core will soldier on a couple years more before becoming extinct, then we might see a <$100 dual core CPU that isn't based on netburst technology.