I love my HD 600 but I was wondering if there is anything out there that is a worthwhile upgrade, while still being a great value. I looked at the Q701 and DT990 but those seem more like a side step, or even a step down. Has anyone upgraded to something that they feel is a significant improvement in sound and value?
Sound yes, value no. I've been able to demo the Stax 407 recently and am demo'ing the TH-600 right now, both have better sound but its hard to say they are a better or even equivalent value. The HD600 can be had for around $300 brand new, that's one of the best values in headphones. If you want better sound you'll have to pay a decent amount more. Something like the HE-500 might be considered an upgrade but again its pretty expensive and probably not the value that the HD600 is. Other than that the only clear upgrades are probably the high-end models like LCD2/3, HD700, HD800, T1 etc.