IMO get Uncharted: Drake's Fortune, Ratchet & Clank: Tools of Destruction, Resistance: Fall of Man and Super Stardust HD.
They are IMO very good to excellent and cheap now. Probably enough to keep yourself busy until releases of Resistance 2, LittleBigPlanet, Home, Motorstorm 2 and God of War 3 later this year. Then games like Killzone 2 and Gran Turismo 5 early next year.
With regard to multi-platform games, investigate on which platform development was lead. Due to technical differences some ported games are slightly worse on the PS3 as can be expected (like early Atari ST to Amiga ports). Some ports are slightly better due to being released later or are about on par due to simultaneous development like Call of Duty 4, IMO if PS3 versions are on par they would certainly deserve preference for the educated multi-platform owner, no worries about disc scratching and far less drive noise production.







