I had the 32 bit version of BT5 installed and it seemed to be working quite well. I decided I wanted to install an SSD on my system. The cloning process went terribly wrong, something to do with...

##I had the same problem with a fresh install. This was the way that I worked around
##it. Open up a terminal and type the following....

add-apt-repository ppa:ubuntu-x-swat/x-updates

##it...

I had the same issue as you with a new install. It only gave me two options which were nowhere near my actual screen resolution.

Try this if the Nvidia-Settings is giving you a "run nvidia-xconfig...