Low HP is something I'd avoid, unless you use Sentinels alot in your Paradigms. I can't stand Sentinels, and only used them in battles where the game forces me to.

No Stagger is something that appears on Fang's best weapon. Its not really a problem, as long as one character in your active party does not have it. I used Fang with such a weapon, and Lightning and Vanille without it, so it was never a problem. No Stagger only means that the character armed with that weapon can't stagger the enemy. Other party members can do it fine.