Texturen
Hi Res Character Models
Stuff That Makes Geralt's Life Easier
*As for the VO's, play in Polish. That's what I did.
I just downloaded the game from GOG and installed exactly those three mods + Flash Mod + FCR.
It seems that there are not too many mods for the Witcher, at least that I can find.
Here are all the mods I could find:
http://www.moddb.com/mods?filter=t&kw=Search+...&released=def&style=def&theme=def&game=10062&type=def&sort=dateup-desc
Texturen + Hi Res character models makes a huge difference, definitely a big improvement, although there are still a couple of textures that seem low res. I suggest if you install these textures to make sure to use 16 x Anisotropic Filtering and high visible distance. AF seems to help improve the textures a lot.
I just started the game, so far at the beginning of the game, Hard difficulty with FCR it is not too difficult. Keep in mind there is also a "normal" (easy) difficulty setting with FCR.