I've been using Rhiannon's texture "JoJo" from PoserPros.  It has been doing great for me.  And I think the Genesis texture from Daz3D is great also.  I have them both, but I mostly work with JoJo.  You can see a render I did of her at www.renderosity.com/mod/gallery/index.php.  You can get her at poserpros.daz3d.com/store/viewitem.php.  (I hope it's ok to reference the site here.  I apologize if that is not allowed.)

Hope you find what your looking for.  Keep in mind too that it's not JUST the texture that counts.  It has to be lighted properly to get the best renders.

Best of luck!