Beyerdynamic DT235 although not the most attractive thing in the world.
The philips cityscape downtown is 40 bucks on onesaleaday "flash" section. Was on tyll's wall of fame. I have never heard it.
The Koss Portapro is $40
I think the CAL is $50 but again never heard them, though people call them the poor man's M50.
What do you think of the JVC HARX700? How do they compare to the ones you mentioned?