You need to talk to Bruce. He has a 2000 GV with Rancho rears & OME fronts it has nice flex..
I'm fairly sure you could go 50mm lift without fear of damaging your CV's as long as you dont go bouncing the thing and shocking them to death.
I installed a 70mm lift into my mates 98 Vitara King Coils & Spacers (Has same front end as a GV) and he has no worries. His CV's are on a better angle than mine due to the different lower control arms. & I've dropped my Diff 2"

have a look and see what you rekon.
You will need camber pins and they are not cheap.. I got mine from Pedders and they were $110.
See it here -->
http://www.nbs4x4club.com/forum/index.php?topic=7444.0