Actually Atlus just tweeted yesterday that they're considering reprinting Radiant Historia... So good timing.
Not to self-incriminate or anything, but that's great news for me too! It's probably the best DS game I've played that isn't part of a long-running series (Cough, Cough...Dragon Quest...Cough, Cough).
Even if they don't reprint it I'm going to get it. I'd pay the $100, seriously.