Intel released quad-core cpus. Of course they are expensive, but they’re available. And their existance can only push down the price of dual-core cpus. I’m an AMD man myself, but kudos to Intel for raising the bar.
I have a dual core that I use extensively for Blender. It makes a world of difference. I can continue modelling while I render an animation, or use both cores to complete the animation faster.
Quad core chips will make theaded functionality all the more important - especially for processor-intensive tasks like rendering.