T
I liked the remake of Final Fantasy 3, and if you like Pokemon games then get Diamond/Pearl, any of the Digimon World games, or Dragon Quest Monsters.
K
Most good DS RPG games are classic RPG style'd turn by turn attack :)
A
Final Fantasy III, Final Fantasy IV, Pokemon D/P etc.
C
Pokemon D/P gets boring after a while. I suggest a Turn-Based RPG such as Luminous Arc. Or, if you're into traditional RPGs, Final Fantasy III