apart from very occasional flirtations with curriculae, as curriculums is just plain ugly to say.

Am I missing something? I'd say 'curricula', if I ever had to cope with more than one of them. I've never heard 'curriculaae' until reading this thread.

Then again, I'd use data and agenda as singulars, even though I know the usage to be technically incorrect, so don't count me as an expert.