Maybe something like a 210:
http://www.nvidia.co.uk/object/produ...ce_210_uk.html
But you don't want that. Honestly doubt it would run SH5 any better anyway.
Even something like a 9500GT, which is pretty low spec and not quite up to SH5, requires 350W (or rather, 18A on that 12V2 rail).
You just can't hook up a decent card to that PSU, and even if you could I doubt that CPU would be willing to cooperate.