Did you get your Nvidia drivers through YaST? if so, that is out of date. Go to www.nvidia.com
and manually download it. Should be version 77.77, I believe.
Also, can you post the monitor section of your /etc/X11/xorg.conf file? Open it using Kwrite or OpenOffice. Find the monitor/video card section and copy/paste here. Just want to make sure you are pulling the right Nvidia drivers.
And yes, Mandriva is also good. Just as good as SUSE. I use Mandriva on my desktop and SUSE on my laptop. Both are great!
PS - stay away from debian if you're new to Linux!