External or custom power supplies

I have a Gx280 dell optiplex small desktop. intel Pentium 4 3.0 ghz processor, 2gb DDR2 Ram, Intel(R) 82915G/GV/910GL Express Chipset Family 128 Mb (graphics card).

So anyway i want to upgrade my power supply for a new graphics card but the best dell offers is 280( or 250). Which really can get me much.

so i was wondering if there was anywhere that offered either a better replacement for the power supply, or offered external or custom sized power supplies.

in the compatibility it says it supports dell gx280 but it doesnt say which form. Im assuming its not the small desktop form because it doesnt look like it would fit.

I called they said it wasnt for the gx280 small destop version. I also talked about their custom options and they said it cost 50,000 for the first model.

yeah i do have an extra dvd slot(not sure if 5 1/2". Could you go into more depth into what an auxillary Psu is?

I could kiss you right now man (no homo). I have been looking for an answer to this problem for ever. One more question though what exactly is a dvd expansion slot size. How would i know if it is 5 1/2 ". Is this a standard size for all extra slots? My Gx280 does have a DVD Rw player and i would mind taking that out.

That PC Power Cooling PSU isn't the SFF version, I'm thinking its the mid-tower one.

I did some research on auxiliary power supplies i didnt get much but i found out but needs a cord. does the newegg one come with the cord or is my main PSU expected to have it.



EDIT:

I looked up some more and i think i need a PATA connector which im pretty sure i have.

I looked up some reviews onnit and i completely understands how it works now. I posted before i looked at the reviews so i had no idea what i was talking about. Anyway thanks a lot man you really helped me out.