If you're up for imports, Ouendan 1 and 2, as well as the American Elite Beat Agents are both nice games.

Super Robot Wars W is also good if you want a strategy game, there's a pretty comprehensive translation guide on Gamefaqs.

On the PSP, I thoroughly enjoyed Final Fantasy Tactics: Lion's War, and Jeanne D'arc isn't bad. I'm hoping to import SRW Compact, I think it is, as well as Vantage Master.