The most common pronounciations I've heard (and used) are "bona fide" to rhyme with "hide" and "prima facie" as "preema faysha." "En banc" I've heard as ""ahn bahnc" and "ahn bank." The former is probably more correct; the latter is more common and widely accepted.
So am I better off using most COMMON pronunciation or the CORRECT one? Should I go with mainstream? I wonder what italian-americans feel when americans mispronounce these words...do they feel obligated to do it too?