I've been all through the headphone world and few cans have ever done it for me the way the HD25 does...
I've had 2 really expensive cables at different times and didn't like either one of them, especially considering the price. But the HD 650 cable is definitely a worthy upgrade IMO...
Here are my two pair. One cable is 36" and reaches exactly to the bottom of my jeans pocket. The other is only 16" and lets my Shuffle hang like a weightless pendant. The other 6' of that cable got a 1/8" female on it to serve as plugin extension to my GS-1 + MAC, a great setup. I occasionally use my portable amp but really, it's not necessary.
And with the velour pads you're looking at the greatest set of cold-weather dog walkers ever...
Just great headphones and IMO these should be part of any serious canhead's kit.
-Jim aka 251