Sorry - I jumped to conclusions when you mentioned your main genres. "Most" people who have those main genres seem to be looking for a bassy can. I should have asked first.
First point - you're not going to find a closed can with really good accurate soundstage (unless you go top tier) - for that you need an open or semi-open can.
You could try the 940 - but to me they weren't well balanced - quite coloured as I mentioned earlier. Again - even with bass aside - I don't think they'd particularly suit your genres. I'll go back to my original suggestion - Fischer Fa-003 or Brainwavz HM5. There are reviews on both - they're practically identical. They also tick most of your boxes:
* Not bad soundstage for a closed can
* Great sound quality
* Reasonable accurate / balanced sound. Perhaps a little etched in the highs. Good mids and bass impact.
* Detachable cable
* Well built
They'll do most genres well. Remind me of my HD600 - just not quite as natural + the HD600 has better presentation, dynamics, and is a little more laid back.
Basically you will have to make a choice on the strengths. If you want a gaming can - get an open or semi-open. If you want a closed all-rounder, try the FA-003 or HM5.