Hello Christer
I actually prefer big headphones and was always carrying my lcd x with me. Since the broke down in HK I bought the vegas, firstly because I wanted to listen to Music and secondly because I have too many big headphones. Ultimately I was pleasantly surprised by the vega's... As soon I have lcd-x will travel withthem together w Vega, sleeping w lcdx on the head = challenging...
Now back to bassy opera: this depends on frequency range you consider bassy. I like very much Handel, Mozart, Donizetti, and you agre right, there are places with sub-bass (such as Haendel Rinaldo, where a thunderstorm is creared by vibrating a metal plate), but For example Le Nozze di Figaro is not too heavy on bass...
What are my favorites: Mozart - Le Nozze, Don Giovanni, Cosi van tutte, Zauberfloete, Haendel - Tamerlano, Rinaldo, Wagner - Meistersinger, Ring, Fliegender Hollaender, Donizetti, Monteverdi.
re Headphones in airlines, fully agree, I use normally the audeze' because the quality of the supplied ones is inadequate