Then just walk away. I had the pleasure of listening to the RE272, and it's a great phone. Sometimes you have to ask yourself if you've crossed the line of overconsumerism.
I'm almost willing to bet that you'd get more satisfaction from buying several more albums with the RE600 money, than you would from a new headphone.
Once you understand why you want something, you may not find your desire so strong anymore.
There it was, your moment of zen