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Why not look up reviews before you buy? My website, Appgamer.net, has plenty of suggestions.
Anyway, for paid game apps you really do need:
Angry Birds
Cut The Rope
Dead Space
Real Racing 2
Infinity Blade
and more companies are doing a free version with a single in app purchase to own the game once you reach a certain point. I recommend trying out Starfront: Collision from Gameloft.