I really like rDNA EyeZ, and they have add-on packages that are pretty good too. There's a fit for just about everyone with them. Another good set is the PoserStyle High Res Eyes. You can get them with a PoserStyle subscription, although they have a lite version in their freestuff to try. There's also Real Eyes by cake1. These are individual props for each eye. All of them are good, but I do prefer the rDNA EyeZ.