Psp games help

I'm thinking of getting a new psp game, probably an RPG. I'm thinking between Crisis Core and Monster Hunter Freedom 2. I've played FF7 up to the part where you're at that carnival like thing past where the Wolf like dog in your team old town. I liked the game mechanincs etc, but never really got into the story. I heard Monster Hunter freedom 2 is a hard game. I like challenging games but not doing the same mission 10+ times. I like games with a good story line and gameplay that doesn't get dull after 20+ hours. I've played only a few rpg's on the psp like Kingdom of Paradise, but they got boring after a while. Stragety RPG's I have played like Final fantasy tactics on GBA but it also got boring, not really into stragety. I'm open to other suggestions of games. thanks.