RE: sound/video/photo editing...
Hi,
In my experience, sound/video/photo editing are CPU intensive, and bound, tasks, so faster CPUs with larger cache memories tend to make shorter work of these editing tasks. So, it all depends upon what your time is worth? One way to look at it is: Is the 13% speed increase (11% time savings) worth $100 to you over the life (3 yrs maybe) of the computer?
Switon
P.S. That $100 spread over 11% of 3 years of computer work makes it look like pennies (or fractions thereof depending on how much you actually use your computer doing editing) per hour of your time. I can't imagine that your time is not worth more than that.