If you are stuck with Vista on a laptop, I would stay away from AMD dual core CPU's due to the clock bug which has yet to be addressed.
Easycor, not sure where you are getting your information, but the mobile line of CPU's from Intel are designed by another division of Intel. They have been so successful, they took the design and used it for the basis of the Core 2 Duo family of CPU's.
I got to spend some time with a foundry manager from AMD and that is exactly what he said AMD was concerned about when AMD was king of the hill.