I don't want to use Isildur as my RB for two reasons; one, it's not movie-block legal, and two, in my experience, Isildur is too easily corrupted.
Isildur, Bearer of Heirlooms and The
Scroll of Isildur is 9 resistance. Move over to movie block and that necessary copy of
Sam, Son of Hamfast makes it (in effect) 12 resistance. Sorry, when I recommended Isildur, it was under the stipulation that you moved to Movie Block...
The problem with Aragorn as your starting companion (with Frodo, that is) is the likelihood of a swarm wiping you out in turn two or three if you get no companions (or get
King of the Dead or
Shadow Host instead of the little guys).
In my opinion (already stated), two more copies of
Morgul Ambusher and four copies of
Morgul Destroyer would be a better call than the Nazgul. But playtest and let us know how it turns out!
-wtk