Title says it all.
In my own personal interest I want to know the best under $150.
HOWEVER, I like to hear discourse regardless on this kind of thing.
Go for it.
The best passive isolation that I've heard from various cans (in approximate order of increasing isolation):
Audio Technica M50
Phiaton MS 400
Senn HD 25-1
Senn HD 280
Of those within your budget, the HD280 is probably your best choice.
Glad to see m50 and 840 in it. I am using the UE600 with the noise isolating tip. It could block out all the street noise (only very few cars) while have my music on the 30% volume. Not sure if the headphones will do a better job...