FFXIII-2 End game monsters?

So this is my favorite game of all time and I have played it through many many times trying out different paradigm packs. My main Medic monster is Haguma - easily the best Medic in the game, Odin as COM and Yakshini as SYN. But I need some good monsters for my next pack (trying to get achievements) so I need some more good end game monsters for each role. I have for end game the Caterchipillar and gigantuar for MED and SYN are they good? Any other suggestions? Thanks