You won't unlock everything in the Crystarium until you beat the game. There is another stage to it that unlocks after the game is won. That is when you will start breaking the 10,000 HP barrier. However, even with all of that I think the best you can get is a little over 40,000 HP if you equip Snow with 4 like 3000 HP accessories.
The role level ends at 5 which you won't get until Stage 10 of the Crystarium is unlocked.
As for accessory, different accessories are needed for different fights. You can do a auto-tetradefense which gives Protect, Shell, Veil and Viligance I think. But it tends to run out a lot sooner than a Synergist's skill. I tended to go more towards Strength or Magic bonuses since they are more actively used and will always be present. Plus with a little work you can make them a +350.
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