Wow, I get engrossed by work for a week and come back to find that you've fixed
everything and more. That will show me.
For future reference, here's what the previous version looked like on an 8800GT:
pretty weird. Every crash I'd experienced was also reported in the patch notes. The 10.9.3
NVidia drivers are different from those Apple ships in that they enable certain card features (like ECC ram), and -- supposedly -- bring performance updates. I think they're basically the nvidia-updates-331 built for BSD/Darwin with a pretty gui on the top.
I'll let you know if I run into any more problems, but well done for fixing everything -- what was the cause, after all?