That PSU has some 25A on it's 12V rail - so it offers 300W which is more than enough to handle OP's rig with the above mentioned gfx card ( that card don't require a power adapter - remember ? ) and Op wanted the cheapest PSu he can get - so suggested him FSP Saga II 350W.
But at Full HD resolution, do you think that HD 5670 or HD 6670 can really cope up with even some of the current generation games? I think HD 5770 will be the best card to offer best performance/Price ratio at the price point.
GEt MSI HD 5770 @ 7K and Tagan Stonerock 500W @ 3K
If gpu budget is strictly 6k, then consider gts 450. Otherwise 5770+ fsp saga II 500 is a good deal. You can also opt for 6770 instead which is 5770's successor.
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