Reccomended PSU

It'll handle a 7900GS, but a high end DX10 card might be pushing it a bit. It's not a fantastic PSU anyway. I'd strongly recommend the Corsiar HX520W, a far better PSU. If it's priced a little high, the Enhance 5150GH would be my second choice.
 
Go with a 500 watt powersupply. That way you will have plenty of wattage and room to upgrade in the future. 550w would be even better.
 
Wattage is far from the only concern when selecting a PSU. Either the Seasonic or the Antec should handle either of those cards without issues. If the modular interface is unimportant, however, I'd go with an XClio Stablepower 500W.
 
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