Actually, if you are looking at a GeForce 4 generation card, the open source nv drivers probably have it covered. It's only once you get to the G80 generation and above you really need to use nVidia's drivers to get the most out of your hardware
I believe the recommended number from the open source nv drivers is something like "96" - this off the top of my head.
If I recall correctly i think I tried it once, rebooted to a black screen and had to bring my laptop to a friends place who connected the laptop to a monitor which could see the screen. as there was no time for tweaking we just removed the offending drivers.
someday when I have the time I'll try this again.
Ubuntu works fine even without this added stuff. and yes, it's not perfect, but so far it works for me.