@EvanKrall I probably wouldn't use an ND. I would probably find a proper solar filter. There are probably even specialized solar eclipse filters.
@EvanKrall: Assuming you get a diamond ring, there will be a point at which you probably don't need an ND. If its only partial, then whatever part of the sun shows is still going to be incredibly bright.
If all you have is ND filtration, your probably going to need several stops at least.
A 1, 2, and 3 stop kit might be good...that way, if necessary, you could stack to get 6 stops.