LF, LF2, LH and LH2 are among my current favorites for the variety of looks achievable with what vendors have provided both in character sets and a huge variety of morphs and textures.  All the included people with Poser increase variety although they were never as well supported as DAZ Gen 4, LF, etc.  DAZ gen 3 and gen 4 content is good but I find that V4 has a look that is a bit harder to disguise than the recent figures (LF, etc.) but again, using morphs to modify characters and mixing and matching and (gasp!) taking textures into a paint program to modify really makes it possible to come up with unique characters.  Red Phantom's comment about scaling characters is particularly useful if you want more variety (I have a particular weakness for females shorter than the Poser ideal, being a bit of a "shrimp" myself).

Throwing the fitting room into the mix gives you the ability to dress your characters with great variety.  Costuming often makes the character.

All that being said, I wish that sales volume supported more new content creation for Poser but that is what it is. =\

To maldowns, I say welcome back!  Poser is a lifeline for teh Mollz, too, in this brave new world of AI slop. >.<  Any support I can offer is yours! =)

Teh Mollz