I’m very happy with Sennheiser HD600 which I like much better than the HD650. The HD600 has a better overall frequency response and a better stereo stage. It sounds like it has more space in the image. The HD650 has too much emphasis on low end and blurs the overall sound IMO. I’ve also tried Beyerdynamic DT990 pro and AKG K501 but it’s not really my thing.