help with saving "save games" and putting onto new system

I recently got a tv bundled with a 40gig ps3 but really want the mgs4 bundle. I'm selling the one I have but have a gta4 save that i want to keep. I have a 2gig san disk with usb connection thing and was wondering if it was as simple as copying to my sandisk and then copying it back on the new ps3.

Thanks!