I don't think Monk would give you very much in terms of use. You'd have:
-More hp
-Boost
-Dodge
-Focus
-Chakra
-Counter, Martial Arts II and Subtle Blow
That's about it in terms of things that stand out.
Whereas, with Warrior, you get:
-Berserk
-Defender
-Warcry
-Def Up and Double Attack
Monk may get more bonuses, but Warrior's are more useful, imo.
Also, I prefer RNG/WAR over RNG/NIN any day.
