I've had a lot of fun reading through this thread. Here's my brief list:
3. T5p (modded)
I happen to agree with him as well.
The HE-500 are one of the absolute best at it's price and under $1k. You can still squeeze so much out of it by upgrading your amp and dac. No need to rush to summit-fi phones, you've got something wonderful there.
1. Still looking for #1.
Started a thread on the subject here http://www.head-fi.org/t/734599/oh-no-m50-7506-honeymoon-already-over-now-what
2. V-Moda M80: Toss up with the M50's. Only pulls ahead because they are stellar portables.
3. ATH-M50: Great for casual listening but not good enough for mastering.
4. MDR-7506: Great highs, tight bass but too scooped.
5. HD-280: Great isolation for home studio, not my favorite audio.