SW20 Turbo CV Joints

Hi everyone,
 
I have been tracing a slight creaking noise in the car and it seems to be coming from the rear left outer CV joint as it comes under load. I am thinking this could be early warning of a pending CV failure so I have started to try and workout if there is a heavy duty outer CV joint available for it or are the factory outer CV joints fairly reliable?
I have found the CRW heavy duty inner CV joints just not much in the way of heavy duty outer joints so I was hoping to hear what other people have experienced in regard to CV's and also where is the best place to get the outer CV joints. (standard or heavy duty) 
 
Thanks in advance
 
Nikayla