Disabling nouveau and nvdia modules

I have resolved my issue with installing the nvidia modules with a systems that need it by disabling the xorg nouveau/nvidia modules from loading:

http://http://www.linuxquestions.org...-video-837880/

But by disabling the xorg nouveau/nvidia modules now the systems that need this module will not have any video because of the loading of the nvidia stuff. So my question is how can I get the 2 to coexist with one another? Is there a work around that will allow me to have both the modules loading at the same time to cover a bigger variety of video cards?