to the forums.
RAM is more important when you are jugggling around with a lot of video editing or several things happening at once.
A better processor will help when rendering or processsing things down, but if you are not creating a 3D pixar film then you dont need that much of a powerful processor. It just helps.
So personally I'd go for more RAM.
I'd go quad core over dual core.
http://en.wikipedia.org/wiki/Multi-core_processor