if i find all my modular cables... i can sell u 700watt 20$ xD


but no that 250 is not going to handle everything at once..
by a powersupply first.. 400watt shouldnt cost you more than 30$ , i got mine 20$ shipped(used one from slizone).

then get a used 7series gfx card like the 7300gt.. its real good for low ends