Some older Final Fantasy games are on PSN for ten bucks a pop. Everything newer than X is garbage and X ain't so hot.
I'd vouch for V through IX. Heard good things about IV but I haven't played it. Didn't much love IX but it's better than what came after it. Nobody will stick up for VIII. I will. VIII was solid. Combat was decided more by strategy and preparation than grinding and, while the main character is a douche, it's probably the best story in the series.
...It's April 1st today. And I'm not just saying that because I'm Australian (as it's already 3:15PM here); a number of companies have already brought out their pranks, including Google and their 8-bit map, along with Notch (of Minecraft fame, for those few who don't know) announcing his new game "Mars Effect".
EDIT: Ah, this just made me realize that daylight savings changed here today. Gotta switch the clocks...