Never heard the woo3, but I can say that I'm loving The Raptor in my rig & especially with hd650. But does it sound $700 better than the woo3? I guess that's the $700 question. Imo, the Raptor is a more attractive piece of hardware, and there's the Ray Samuels service & support factor...but the sound is ultimately where it's at.
Any chance you could buy both, compare & then return one of them? And then write us a nice comparo review?