Also, all 7300 GS seems to have mandatory "Turbocache", which reserves part of the system memory for the videocard, thus reducing the memory available to the system.
For about a $ 45 price difference, it seems worth it to step up to the 7600 GS.
7300 GS is a valid choice if you have no interest in playing recent games, as it is perfectly able to drive hi-rez monitors in 2-D applications.