If you have the Reby Sky hair, have you tried using SG's subdivision script on it (  I won't insult you by asking if you tinkered with the materials since I think that is almost the first thing you do with everything  :) ) it isn't widely known, but the Reby hair was one of the early Daz experiments with subdivision and ongoing LOD stuff, so it is not as high poly as most hairs of that style and always looked pretty bad in Poser.

Also, it might be a bit wavier than you want, but the Tatiana Hair can look pretty good as well. http://www.daz3d.com/shop/tatiana-hair