u cant be disappointed with one 4870x2, in some games dual x2's doesn't even win over a normal x2, screw the gtx 280 get a 4870x2!. a 4870x2 will handle anything on ur 24" for a while, when its getting old just sell it and get a new card, that way your not left with 2 cards that a 5870 will beat. there might even be new cards, or soon releasing cards by then anyway.