Reduceing the WOW folder size

My WoW folder is over 14gigs now. Other than the obvious patch data I can delete, what else is safe to remove from this folder. It looks like 90% of the size is from 6 *.mpq files in the Data folder that are about 10-11gigs in total. Are these required for WOW to function or just compressed install files that are no longer used.

What im thinking about trying is to put WOW on a RAM disk and run it from there. But 14gigs far exceeds the ram I have available for this experiment.

The only addon I use is Jamba so Im not able to remove any bloat from there.

the .mpq files house everything that 'is' the game. They are required for WoW to function.

My data folder alone is 13.6gb so good luck :/