Which power supply for GV-N26SO-896I (gtx260 super overclock)?

Hello everyone...

Ok here's the thing:
I'm getting a GTX 260 Super Overclock Series, 896Mb GDDR3 448bit,
but have got a crap power supply...
Got intel core 2 duo E6750 proc, 4gigs of ram, and now I need an advice about the power supply.

As I won't really have much money left when I get the video card, I'm wondering which PSU should I get, because gigabyte insists on something like ~550W psu.. I know I'm asking for the impossible but I guess I should be buying a good brand PSU, but on the other hand I'm also looking for something cheap, or well, as cheap as it can get but to be good enough for my config.
Any solutions?

Thanks in advance!

P.S. I think the video card needs 2 x six-pin connectors

Edit: also the mbo is DFI LanParty DK x38 series