I think the MDR7506 and V6 provide very good audiophile level sound. However, I mainly recommend them (and value my own) for how well rounded they are. They sound pretty good, are relatively inexpensive, extremely durable, portable enough, isolating enough, comfortable enough.
However, once you get into more expensive headphones devoted to only sounding amazing (such as the MS-1, which I don't think anyone would suggest using as daily portable headphones and putting them in backpacks or the like), they can't really compete any more.
Since it sounds like you are starting to get the upgrade itch, I would wait a little longer until you can stretch your budget some more. It is worth it to wait and make one big upgrade than making two or more along the way.
Maybe one of the higher end Grados is what you are looking for? SR-225 and 325i are both great.
Happy listening.
Hm, since I posted this HiWire has said the MS-1s can survive in a backpack.. very impressive
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