Quote - I use V4 and M4 extensively so i can only really comment on eyes for those figures.  When I buy a character almost the first texture I change is the eyes as it seems very difficult to find a character where the reflections are not burnt it. 

In addition to those already noted here, that I have used, one of my favorite collections is SG Realeyes by Surreality.  It has a number of options for the build up of the eyes and all its parts.  They are still available at Daz for the same price I paid in 2011, just be sure to search for Realeyes, with no space as the search does not find them if there is a space.

Yes, I had forgotten about that set but can second it: Surreality's Realeyes are very nice.