But when Sandy Bridge ships, the roadmap will show future plans that are even better. I you keep waiting, you will never get a Mac.
I do have a Mac, but I try to target trends in technology that make upgrading worth the cost. For me, quad-core is the next logical step, as are a few other technological improvements, e.g., 6GB/sec SATA, Zero Power ODD, Wireless Display, Hydrive, SSDs, USB 3, LightPeak. I don't need everything, but the only real compelling upgrade since the purchase of my BlackBook 2.4GHz C2D has been better battery life (not worth an upgrade IMO because the 4hrs I get is currently sufficient) and better screens, but I need to purchase the MBP 15" for the matte. Thus I am waiting for a technological jump before upgrading and the Huron River platform offers a number of new features in which I am interested.