Ps3-what game should i get!?

Fallout 3 has trophies and is very fun. It's an open-world sandbox style game set in the latter half of the 23rd century. It's about what happens after the world was almost destroyed by nuclear war. It's really fun, you'll get hours and hours of play out of it (at least 60) and the trophies are quite fun to get. There's lots to do besides trophies and story quests though so have a look at a review on IGN to get an amzing picture of a great game.