I have purchased a lot of hairs and find myself gravitating more and more to shoulder length or short hairs as they seem to look the best to me. Nevertheless, I thought I'd give you my opinion. I use the hairs from 3Dream & Mairy a lot as they have so many morphs built in. You might look at their Akaste hair. The promos are rather basic and unfatering, but I think they do this on purpose. Akaste can be lengthened with supplied morphs to the shoulder. They have this "behind the ear" morph I really like as it uncovers a lot of the face. I posted a rough image of it. That may be one of my shader in the image, I don't recall.

http://www.renderosity.com/mod/bcs/akaste-hair/82615#

They also just released a hair over at Daz I bought on sale but have not done much with it yet.The style might be more of what you're looking for. It's also on sale still.

http://www.daz3d.com/shop/hair/marja-hair

I'm curious to see what others recommend.