The pae is basic kernel and extra ram
The pae.bfs is pae and bfs modifications, could be helpful depending on your usage
Install it and see if it works and is stable in your hardware
About nvidia, do you have a nvidia video card? If that is the case, be sure to select
The right driver for it, sometimes when you change kernel the video driver could be changed so you could need to set driver again
I would say that if you don't have stability issues leave the kernel and driver and enjoy
Glad i could help you.