if you want a game that's different, try playing an old style game, or one of those indie games (Slender is supposed to be good, but it's only for those who like being scared, so I haven't played it). Failing that, Team Fortress 2.
Dragon Age : Origins is possibly my all time favourite game on the ps3. And although time has taught me to absolutely hate DLC, DA: O has a lot of good DLC along with a whole expansion continuing the story. I'd give DA2 a miss though.. Seriously.
Also, Heavy Rain is a good story game, I played through it in an evening and got quite emotionally attached to the characters after saying I wouldn't xP
So basically, I agree with the people that said DA and Heavy Rain - Go get them!