I would have to say My Michelle is my favorite.  I suppose there is some bias there but if not that figure, I'd go with Stephanie Petite (gen 3) :)

We attempted to get a free set of alternate UVs out for My Michelle which would remap her to take V4 textures and the work is done, however regardless the method (RTEncoding, etc), DAZ doesn't seem to be particularly keen on the idea (I sought them for permission) so it has been shelved.  That's the way it goes sometimes, I'm afraid. ;)

Anyways, back on topic, its very interesting to read about everyone's favorites.

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