Originally Posted by ZARIM
The UM3x, SM3, ATH-CK100Pro, Sony EX1000 has wide open airy soundstage and they shows great details in mids, highs with tight punchy bass.
I'm gonna have to disagree on the UM3X and the EX1000. Soundstage is probably the biggest weakness of the UM3X (though they do have GREAT details and tight bass) They're pretty closed in for the most part. And the EX1000 do offer a great soundstage but the isolation is poor at best. If the OP plans on using these in a casino he's likely to hear everything around him and that'll greatly reduce the soundstage emersion effect.
However the SM3 offer great soundstage, details, AND isolation. Go with the SM3.