You need a better PSU than that. I'd advise a Corsair CX 600 for that card. You want about 550 watts or higher for that card and getting a 600 will give you headroom to work with. Cooler Master PSU's are only good in certain model lines, and that ones isn't fantastic. Also do some price checks on a 7850 or 7870 and see how they compare to the 660. The 7850 is about on par with the 660 and the 7870 would be better than both.
What's your case, because a high end and longer video card may not fit.
Judging by this picture, you're going to be pretty cramped for space. Can you measure along where your PCI-E port is and see how much space you have to put a graphics card in?
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Oh, my computer has no graphics card. It is intel, therefore there is nothing there....
So would it fit? That's my main concern...