You asked why I want to run Ubuntu. Well exactlu 5 years ago I was playing with Ubuntu (Hardy Heron) but I and into trouble trying to get a dual monitor runing. I ended up messing with the xconf and messed up the install and went back to Windows. Running on one screen gave me a good taste of Ubuntu, though. B4 I die, I gotta try again.
I posted something back then. The discussion went like this:
Re: Hardy Dual Monitor (dual head) with nvidia GeForce 9800 card
Back-up your xorg.conf file in case it got messed up and you have to revert to the currently working one:
sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.bak
Next, run nvidia-settings with sudo:
Click "X Server Display Configuration" on the left pane. Here you can set-up dual screens (it will take some experimenting to get what you want and unfortunately, I don't think it's not the most intuitive application).
Once you are satisfied with the results, click "Save to X Configuration File", quit nvidia-settings, and reboot your PC.