This thread inspired me to pick up an SPL meter last night on my way home. The results were very encouraging, turns out I tend to like to listen at an average SPL of around 70db with peaks well under 80db. I took the measurements with the probe right at the surface of the driver (somewhat conservative) and noticed that moving even a half inch away reduced the level significantly (~10db). I'll try the CD top mod and see if the results are any different tonight. But so far it looks like I'm one of those folks that listens really quietly.
I'll be bringing the meter with me to the next Boston meet so that folks can check their own configurations and get an idea of where they stand. Thanks for the thread and the reminder Tyll. All good music ceases to be good music if you can't hear it any more.