........... get the ATI, it depends on what your doing though, if your just gonna play like medium graphiced games then just get the 5500, and if you wanna play HL2 or source get the 9600 pro
Ewww...X600's suck. ATI isn't even making them anymore. The X700 has taken it's position to battle against the 6600, but the 6600 GT easily whips it's ass.