Well, to be honest, you can get for free several emulators that will play FF1-9 pretty damn well based on your PC. Getting FF13 for Xbox 360 is like getting the ass end of the deal. I mean they cut out major things to let it even run on Xbox.
FFX and X-2 are alright on PS2, but the international versions are 10X better. FF12 is also well played but again, international all the way, or also (PAL)