I'm regularly using SBo's NVidia drivers, since most of my machines have NVidia graphic cards. You need to install the 'nvidia-driver' as well as the 'nvidia-kernel' package and then run the following command:
This will spew out a usable /etc/X11/xorg.conf.
Caveat: this driver conflicts with the nouveau driver. What I usually do is either blacklist it and/or add the 'nomodeset' boot option to lilo.conf.
Hint: installing these drivers with 'sbopkg' is almost as easy as clicking on Jockey in Ubuntu