that chart is if you get just the 6570 which your PSU right now can handle.
actually finding a small sized PSU to upgrade for using a better card ,that would need a PCI power connection, is more difficult than i thought and expensive too.
Athena Power AP-TFX40 400W $119.99
btw, i did notice you are in canada . .right?
that PSU is for a slim line case though you might have a ATX (usual size) but put on its side, by chance would you be able to tell?