I've seen thought that the kg550s and ath900x have decent soundstage, not sure about their isolation though , any thoughts on the t5p's?

I posted a thread before stupidly as I didn't notice this one but -   I'm looking for a pair of closed headphones (which have decent isolation, there'll be alot of traffic noise when I'm listening to them sometimes) and work very well non-amped. I don't think I want something overly bass-y...

Ok so I know I'm asking a lot here but it would be great if you guys could help me out here. I'm looking for the best headphones that still do great without amps and I'm looking for isolation, great soundstage, comfort and being able to listen to them for awhile without getting annoyed and...