What's the most appropriate NLS_SORT parameter to cover all/most European languages? I'm developing an Oracle 11g-based application which is likely to be used by clients in many different countries (mostly European). I want the program to change its NLS_SORT so that it's case insensitive on startup using the ALTER SESSION SET NLS_SORT='???'; command.

I'm going to have a config file which contains the NLS_SORT setting the user wants to use so it is editable, but I want a default which will cover European languages. Which is the best one to choose?
WEST_EUROPEAN would seem to be the obvious choice, but there is no default that lets you avoid setting it on an individual language basis.