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I would say that PoPoLoCrois is one of the best up-to date RPGs for the PSP. The translations are good and the text doesn't overlap just like PoPoLoCrois. If you are deciding whether to get PoPoLoCrois or The Legend of Heroes, I would suggest to get PoPoLoCrois first and get The Legend of Heroes later.
And the other one is Wild Arms:Alter Code F
Wild Arms Alter Code: F is a good revisit to a classic RPG. The battle system remains a fairly neat thing to play with, and the storyline--featuring demons, elflike people, ancient technology, and swords and firearms all wrapped up in a world with a pseudo-Western feel--remains unique and interesting.