FK Design makes STUNNING hair - including the lovely Alanis hair Propschick has employed in her example render here.

FK Design has a pretty extensive line of hair at 3Dcommune:

http://www.3dcommune.com/3d/store/display.mv?vs_fabi

Quarker makes some really popular hair as well, Grace Lion and Sapphire Fox come immediately to mind :)

Regarding photoreal  textures: Cake1 has a really wild set at Daz3D called XCU (extreme close up) this is a multi texture set of the light-skinned variety with unfreckled, medium and heavy freckled base skins with no painted eyebrows or pubic hair. In the expansion sets are eyebrow, eyelash and pubic hair shape options, and you can set colors to match any hair color you choose. Search for XCU at http://www.daz3d.com

Pose sets are freakin ABUNDANT, for free, cheap as free, slightly more expensive than free, and so on. Searches for poses in freestuffs are allways rewarding.

You didnt ask, but Id like to offer that face sets are a great aid to char creation. Here in freestuff there are some exquisite faces and chars from Valea, and at RDNA (www.runtimedna.com) you can find many many really excellent face packages for $5.

If you are developing an appreciation for Posette, which I think is awesome, then for texture realism, you owe it to yourself to checkout Snowsultan's Vickibuser texture for posette. Anywoman at posette forever is also very very good, and there are great face morphs for Posette there as well (www.posetteforever.com)

A Posette hybrid or remap wearing a photo-realistic V2 texture and a fine hair product can pretty  much stand toe-to-toe with Victoria 1 2 or 3 in any render.

Hope some of the mentioned products here appeal to your personal taste. Good Luck!