i used to be hard core Nvidia but when the 9700 Pro came out ive been ATI sense .However i do have a Leadtek FX 5950 Ultra
VIVO card thats hanging in there
The 5600 is kinda old, and was made when Nvidia got pummeled by ATI, so look for say 5900, usually the non-Ultra's are as cheap as the 5600 and I'm sure their probably faster aswell