[Vampyr]

Having just made it to Oerba, which I believe is the last area of Chapter 11, I've reached the level 4 role crystal for all three of my three main character's (Lightning, Fang, Hope) primary roles. Also for each of those characters I have picked up every "main" crystal (not counting the branches), as well as all of their ability/accessory/ATB crystals. All I have remaining on the pure stat buff outliers, which I should have finished by the end of Chapter 11, I only have a few more left on each character.

As for Sazh, Vanille, and Snow, I'm just hording CP. Since I never use them I'm not spending it, and I intend to go crazy and make them out in 1 role at the end of the game. So Sazh will be a super synergist, Vanille will be a super medic, and Snow will be a super sentinel.

After you get out of the Steppes there is an awesome farming area in the "Maw of the Abyss" area. There's a hallway with a juggernaut at one end, and a box phalanx at the other. If you run back and forth killing everything in between (but not including those two things) you can rack up a ton of CP.