I personally don't think you are looking at CV issues, normally they are either fine or blow in half. What you have sounds like driveline noise to me. Here is the issue discussed in our Isuzu manual:

http://www.vehicross.info/forums/sho...4&postcount=20

Hope that helps. I know some people on here that have run the VX for over a year with NO boots on the CV's at all. This could be your front driveshaft, have you checked the CV that is on there?