It really depends on what you need and what your budget is. For the most variety, I'd go for: One of hmann's hair, either Cleo or Gypsy. The Short Curls by mallenlane. Two of Vairesh's hair products. (Trini or Conner and maybe the Julia or LeeLee/LuLu hair.) Daz's Wonder Wedge and the Gel Hair are quite good (I have 11 morphs for the Gel Hair available for free so it looks better for guys as well) but they've been used a LOT so people are holding off on using them for a while. And, of course, Kozaburo is the master of hair. Please check out Digital Babes to see what's available.