I have two headphones, some Magnum V4's from Martin Custom Audio (Amboyna burl cups) and a pair of Sennheiser HD598's. Love them both, although I think the high end is better on the Magnums, but I listen to the 598's more because they are super comfy and fun. The 598's are my first Sennheiser. I upgraded to Magnum's after owning Grado SR80's for a while. I was quite surprised at how much I like the Sennheiser "sound" since folks seem to stay on either the Grado or Sennheiser side of the fence. I'd like to buy "one more" pair of really nice headphones and call it a day. The HD800's immediately came to mind, they basically are everything I like about the 598's (build, comfort, general sound) but upgraded. The only thing is, folks tend to describe the 800's as kind of clinical, and although I know the 598's are colored, I love the fun factor. Would anything higher in the Senn line appeal to me (say 650's or 800's?). Also given some thought at much lower price point to Q701's, but have no experience with AKG and what it might do better than my 598's, or even on the high end Fostex 600/900. There are so many choices, its hard to find true gems based on what I know I like. I'm looking for a set to use with my Audio by Van Alstine preamp (its a full size stereo preamp capable of driving the phones just fine) at a listening station, not for portable use.