I've had mine for twenty years, no issues, no frays, and I'd replace them with other Sony studio headphones if something were to happen.
The cord is a beast. I'm not worried about it failing.
My only gripe is the material they use for the padding degrades after 5 or 6 years. Its super easy to replace however. I like the coiled cord too. I think the "Pro"MDR-7507 which have the same form factor cost the same as the V-6s now.
http://thewirecutter.com/reviews/the-best-150-over-ear-headp...
It's a classic model, used a lot in the TV/studio industry too.
And here's (offbeat but interesting and knowledgable photo gear reviewer) Ken Rockwell's review:
http://kenrockwell.com/audio/sony/mdr-7506.htm
AT M50x, M40x is another solid choice for around $150.
[1] http://www.head-fi.org/t/606937/sony-mdr-v6-detachable-cable...
And it has you totally covered in your wish for an oversized cord.