I just ordered a pair of HD650. I had the chance to try AKG and Grados. They are GREAT headphones. But, for what I listen to: mostly classical SACDs (or DVD-Audio when they exist!) I really liked the 650. The only hic is that I was able to try the AKG and the Grados (lended from a store and a friend) with my 805 and they were great. Unfortunately, I could only try the 650 at the store (that had an Oppo-980 so I could bring a few SACDs). So I might have an issue with 300Omhs. I'll keep you posted.
