Thanks. I've been through that whole process with loudspeakers and eventually found the balance point where I'm happier now with what I have than I would be by continuing to chase incremental improvements. For headphones, however, I never progressed beyond HD650s, and I've never even had a very serious dedicated setup for those. I was in the process of building one up when I ran headfirst into Stax and, based on long-ago listening sessions with electrostatic loudspeakers, instantly knew I needed them strapped to my head. :-)
By jumping straight into a L700 + 727 stack my goal was to create a "beachhead" setup for getting to know the Stax with a good solid state amp. Got spooked by reports of muddy bass, harsh highs, etc., that accompanied the mods discussion. As a new arrival who has never actually heard any Stax, it's impossible for me to decipher whether the 727 problems are severe enough to spoil my honeymoon period with the L700s or merely an obstacle that prevents the 00x earspeakers from reaching their fullest potential.
My order hasn't even shipped yet (I think), so I've been second-guessing whether amending my order to step down to a 353 would put me in a better position to form first impressions. I'm less inclined to head the other direction and invest more in better amp solutions since I'm already heading deep into unknown territory. In any case, my intention is simply to do exactly what you're suggesting: quit panicking and enjoy the music for a while before I entertain thoughts of next steps. And what I got from your response is that the 727 is not such a bad starting point for that. Thanks for that.