Good to hear you're still enjoying them. You've been busy picking up equipment - the HE-500 really need a different cable than the crappy stock cable. Yeah the date for the meet kept getting pushed back and forth. Initially it was set for December but got pushed forward to March 29. I don't know if there will be another meet in the summer, although I'd probably be down.
The next likely meet will be either this winter or next spring. Don't worry about HD800's, there will be plenty of them at the next meet, perhaps even more next time. There was a HD800 on almost every other setup. I'm also planning to get a HD800. Even though I've moved away from headphones and to monitors/speakers, I still feel like getting the HD800 based on my audition. You will enjoy the sound and weight change from the HE-500. I've heard great things about crack and HD800. You're all set